What makes people irrational thinkers?

[Belacqua]

I'm going from a BA in English, years of reading ancient literature, and teaching.  Though, I no longer teach English.  The difference between what I said and what dictionary.com says if the difference between "excessive" and "false."  Before deciding to disagree, do some additional reading:

https://en.wikipedia.org/wiki/Hubris

I cant read long-winded things or that font do you got another source?

As I understand it, "hubris" originally referred to an excessive use of violence intended to humiliate an opponent. From the beginning it had the sense of something excessive or overdone. 

The Greeks thought that the gods had ordered things in the universe, and taking things out of that order was offensive to them. They would punish you for it. This going-out-of-order could include, but was not limited to, thinking you were more highly-placed in that order than you really were. This is the meaning of "pride": over-evaluating oneself. 

Now we no longer believe the gods have ordered things, so the word has shrunk down. It no longer has to do with one's place in the universe, and makes it just another judgment that we can make on other people.

From Aristotle's Rhetoric:

Hubris consists of doing and saying things that cause shame to the victim... simply for the pleasure of it. Retaliation is not hubris, but revenge... Young men and the rich are hubristic because they think they are better than other people.

It gets tricky in English translation, because we also use the word "pride" to translate a different Greek word, which Aristotle used for a proper feeling of knowing that one is really good at something. This is not disorder, but just an honest (and pleasurable) evaluation of being good at something. Aristotle's word for this was "megalopsychia."