I've heard many definitions of feminism. The ideology of

• misandry (hatred of men)
• women wanting to be like men
• misogamy (hatred of marriage)
• hatred of motherhood and fatherhood
• advocating socioeconomic equality of the sexes

I don't see what's wrong with #2, since men are the more perfect sex and everyone, including women, must strive for perfection. St. Thérèse of Lisieux, for example, had a very manly spirituality, even desiring to be a priest, which she knew is only for men.
#5 comes closer to the best definition, but it's not broad enough.
But recently I heard feminism defined as the ideology of not thinking there is a difference between males and females. This seems to be the essence of feminism.

But recently I heard feminism defined as the ideology of not thinking there is a difference between males and females. This seems to be the essence of feminism.

Geremia, great thoughts you bring up.  Yes, I think the above definition would be the fundamental/philosophical error for why feminism is adopted.  Feminism, as it flows from the above error, logically leads to the practical/real-life/social errors which you named:

• misandry (hatred of men)
• women wanting to be like men
• misogamy (hatred of marriage)
• hatred of motherhood and fatherhood
• advocating socioeconomic equality of the sexes

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Great topic.  And this applies even to Traditional Catholics, because the feminist error has infected all of us.  I heard it said recently, and correctly: "Men and women are not equal; they are are complimentary."  This simple sentences reinforces the truth that 1) men and women are both talented and necessary to society but 2) created by God for different duties in life.

In practice, feminism is one of the manifestations of cultural marxism and identity politics.  Men are the oppressor class (and automatically bad) while women are the oppressed class (and automatically good).  It may frame itself as socioeconomic equality between the sexes, but it is not equality at all.  It is about punishing men for being "privileged".

Feminists might or might not recognize the differences between men and women, depending on how it supports their victimhood narrative.  For example,  they talk about "women's way of knowing" and complain about how it is not valued as men's is.  https://en.wikipedia.org/wiki/Women%27s_Ways_of_Knowing

Like all cultural marxism, it is unjust and evil.  Also, the vast majority of feminist claims are simply false.

You are correct, Jaynek, in that you are describing the EFFECTS of feminism in our marxist culture.  But just like the CAUSE of communism is the freemasonic lie that "all men are created equal", so the lie that "men and women are equal" is the CAUSE of feminism...as Geremia pointed out.  It's important to separate cause vs effect.

I agree that most feminists will say that men and women are equal and claim to want equality. And this is wrong for exactly the reasons you say.

But they do not actually believe it themselves.  We can see from their actions that they think that women are superior to men and that men are bad and should be punished.  

The false ideas about equality may the theoretical basis for feminism, but I am not sure we can call them the CAUSE, when this is not what they really believe.

What more do they want?

Women who have been influenced by feminism (virtually all of us) do not know what they want.  They condemn "toxic masculinity" while still being instinctively drawn to male strength.
Feminism leaves women confused and miserable.

The false ideas about equality may the theoretical basis for feminism, but I am not sure we can call them the CAUSE, when this is not what they really believe.

True, rabid feminists want women to rule society.  I agree.  But they are only now being able to achieve this dream BECAUSE OF the false notion that men/women are equal.  This is the lynchpin to the errors of the day.
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Just like communism lied about "all men being equal", which led to govt socialism, which led to communism and the destructive END of some men being "more equal" than others (i.e. communists overthrowing the russian monarchy and setting up a godless dictatorship).
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The point is, that nature abhors a vacuum.  Feminism was created to take away the power/control of men in society so that the NWO could gain economic/political control.  Once you put men and women on an "equal" playing field in society, then there is a power vacuum.  And, logically, if men and women are equal, then why is it wrong for women to want to be in control and try to "fix" society's problems (that men created)?  But those women of this revolutionary spirit are few.  Most women are just following along, not knowing that this feminist movement will end in destruction, death and chaos (just like communism did).  But you could never get to this point unless you first believed that both sexes were equal.
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And to fix the problem, you can't just let the "equal playing field" exist (i.e. get rid of the revolutionary feminists but let the "non violent" feminists continue).  No, the only way to destroy feminism is to re-assert the truth that men and women are complimentary, not equal.  Then Godly order will return (at least in this area).

I was down thumbed by a feminist!

It is not surprising, since most errors of our time can be traced to the falsely named "Enlightenment".  It, in turn, can be traced back to the Protestant "Reformation".  When we study history we can see that all these evils are connected.

Totally agree.  And to introduce a slight tangent, when you view Ven. Bartholomew Holzhauser's writings on the "7 ages of the Church", it's easy to see that we are living in the 5th age (and, thankfully, the tail-end of it).  The beginning of the 5th age, in my opinion, would've been 1517 and the Protestant Revolt, which as you correctly point out, was the end of the catholic-high point of the Middle Ages and the beginning of the Church's problems, which continue to effect us even today.
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But I do firmly believe that feminism and all other "isms" are beginning to lose steam.  People are waking up to the fact that they are empty promises.  It is always the NWO's plan to take everything to the extreme, so that when the current solution then becomes a problem, a new solution is introduced (which is just as bad as the former solution, but in a different way.  When this newest solution is taken to the point of extreme, then solution #3 is proposed, and taken to the extreme, etc).  All of these "solutions/problems/solutions" just further the plan towards the ultimate anti-christ society.  And people don't see it unless they study history...which most do not (and even if they do, they study false history, not through the lense of catholicism).
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Yet, I believe Our Lady will "upset the apple cart" of the globalists/satanists soon.  You can see it slowly happening in many countries, but still, most people think that things can turn around through human/political means.  Not gonna happen.  She will let things continue to accelerate, so that people will "wake up" from the atheist/communist indoctrination and see that the "solutions" offered do not work.  Some won't wake up until rioting/social chaos hits their front door.  Let's pray that it does not take a life-and-death situation for society to turn to God.  I'm afraid it will.