Awesome question. I’ve wondered this myself. I do know some people who seem to enjoy making their disfavor with another human being very evident. Either by saying something to their face, or saying something against them within earshot..
I see it as if they want to pick a fight. Not necessarily a physical fight, but they’re open to it if it comes to that. Even if they would get their asses kicked. It’s almost like they want to prove publicaly (or with a story to brag about) how much the person they don’t like can’t handle knowing the fact that they dislike them.
And/Or it’s as if these people feel they would be morally reprehensible not to allow the people they don’t like to know that they don’t like them. Maybe they just feel they would be being dishonest or something..
As for me, I would say that’s a very misplaced sense of duty. I’m no different than these people in that I act according to my own sense of duty, but it just so happens that I believe we have a greater and more useful duty to get along with one another than to stir up trouble with people who kind of irk us.. or who irk us a lot sometimes. Peace is very important to me.