I have noticed that an almost inverse relationship exists between

A) level of confidence, forcefulness, boldness
and
B) being objectively correct

I could list dozens of examples, but I'll just relate ONE personal anecdote.

I have a non-religious stepmother-in-law (my wife's dad divorced her mom to marry another woman -- I'm referring here to that "other woman"). She recently told my son that Domingo isn't Spanish for Dominic -- after all, it's Spanish for "Sunday".

Uh, no. She doesn't know Latin, nor does she know much about Saints' names, being a life-long non-Catholic. At least her "husband" was a Novus Ordo Catholic for a good decade-and-a-half.

Frankly, my Spanish is better than hers. My Latin and my Japanese certainly are. She lived down by the border for a couple years, sure, but the rest of her time in Texas she has lived in her upper-middle-class bubble with a bunch of other similar white folk.

But I'd never be inclined to start trouble by correcting her, even if she was obviously wrong about something. I guess it's because I'm the exact opposite (trying to get along with people as well as possible, vs. being abrasive)

She doesn't realize that Domingo means "belonging to the Lord" as in The Lord's Day (Sunday) which is also the name Dominic. It comes from the Latin Dominicus.

Why are some people so prone to correct others, even when they haven't a clue what they're talking about? Why are some people so puffed up with pride that they want to shine and look important/big/smart even when they are in a department where they should be racking up some HUMILITY by admitting their ignorance/weakness/etc.?

Poor human nature.

She probably just doesn't know that she doesn't know.  

There was a time in the early 70's if someone told me I wasn't united to the Catholic Church, I would have argued tooth and nails that I was, AND believing every word I said.