I would call that person someone too avoid.

A real self-indulgent narcissist.  

A person similar to your description should be avoided at all costs.  

I would also be interested to find out if there is a particular term for this personality type.  I know someone like that too; the person is unavoidable as s/he is in the family  :sad:

When I said "insist on telling him he's wrong", I didn't mean reminding him everyday or everytime you see him, but of standing your ground in a conversation for example if he's truly wrong about something and being firm on the truth and not letting him "get away with it", this is what I meant.

This kind of person, if corrected, instead of asking "where did you read that/who said that/where is that from/is it true" etc., gets upset, starts raising his voice and bullheadedly insists on saying he's right.

Choleric?

Choleric makes sense as does the more extreme hyperthymic temperament.

Yes, but it kind of insults those of a Choleric temperament!

Perhaps a choleric with zero discipline, who was spoiled as a child, and who has grown into full-bodied narcissism.

I agree with previous posters -- he is FIRSTLY undisciplined, narcissistic, lacking virtue, with anger management issues, etc. -- and oh yes, he's also a choleric.

I think that we must remember that every temperament has its primary faults...

I can say without being biased (because I am one) that a choleric is generally the sort of person picking out a fight - often without good cause...

On the opposite spectrum, a phlegmatic person often does not stand up for things when he needs to because he wants to avoid fights and disturbance...

Then there are sanguine people who have a hard time studying, and melancholics who think too much and are often depressed,


I have been thinking about writing an in-depth explanation of the Temperaments is accordance with virtues and vices.  Maybe it will happen sooner rather than later.  :-)

Hope this all helps, anyhow!  :-)