There are many people who look for reasons to feel insulted or oppressed.

Interesting, it's so easy to understand another from their replies. Once the finger pointing and direct name calling starts they have branded themselves as having deep personal issues.

Before I read the link, I would guess that it's not 'Always' and may be triggered by recent or remembered trauma and/or chemical imbalance.

Now that I've read the link perhaps it's more to do with winning/losing and trouncing the opposition in the game.

I don't need to trounce, I already know I'm the one, ha ha ha, nanah nanah nah .

Sadly some people are just in the habit of stating the negative about everything around them, and might be doing it unconsciously because they don't think too much about what they are saying and how it sounds.

We're all in different grades or levels of maturity. Some of us are stuck without having learned a lot of social refinement, so hopefully it's not too rude to just ignore insults and simply prove the insulter wrong by acting in the best possible ways we have learned to act.

People who insult others habitually are saying more about themselves than the people they are insulting. However, people who are simply stating the truth, or what they believe to be the truth, are simply acting in a way to create awareness about a problem they see needs attention.

I only insult fucking idiots.

it seems to be a common human trait. People like to feel they are superior to someone.It supports their feeling of social position. And some are quiet about it and some aren't.

Not true for everyone!
The corollary is, "Those of you who Think you know everything are Extremely annoying to those of us who do".

Yes…in a nutshell!

Some people are not aware that they are being insulting. Some do it out of laziness because they do not care. Some are left with no other resort by their respondents. Some feel that telling the truth is more important than another's feelings. Some have been raised in sub-cultures where they are not taught any other response. Some feel that belittling others is a way to overcome their own feelings of inferiority. Some enjoy drama. Some want to gain attention. Some want to attract the attention or approval of a third party. Some want to attract attention to what they feel are neglected ideas, which will not get attention unless spiced with drama. Some feel that other human groups are not worthy of respect and that giving them such belittles the respect they give their own group. Some want to attract violence to themselves, as an act of self sacrifice. Some do it to manipulate the mental state of the insulted. Some don't do it, but are thought to have done it.

And probably a lot more reasons.

My favorite new phrase - Ad hominem.
Since I try to stay on topic and know attacking others does not promote an intelligent discussion I refrain from name calling or denigrating another's opinion.

I like to insult more when I'm winning an argument, it feels nice to rub it in someone's face every now and then.

Compensating for their own sense of worth by denigrating everyone else's. The only way some people feel they're on top of things is to try and push other people down. (coughTrumpcough )