why do conservatives go out of their way to antagonize liberals, and vice versa?

I'm a centrist, to clarify, but I've scrolled through these questions and I've already found two different people trying to make liberals look bad. It just looks like this huge echochamber of people bashing liberals without making any real points. Both sides of the political spectrum are cool, but I genuinely don't get how this is a thing that exists

Is there some psychological thing that makes people do this

is there a reason this happens

i'd like to know