Lot of things but one is
Sadism in picking an outcast to mock and then justifying it for faux moral reasons
So many times there is a random individual that becomes the target of the harassment of thousands or even millions of people, just being relentlessly laughed at and made fun of. That's one thing, but even worse is when people try to justify it through moral reasons, claiming are a bad person.
You see this even with "bad people": so many times normies will express this violent sentiment, of how they want to kill some wrongdoer, and there are mass hate campaigns. And I get that, we do have violent instincts, we're just animals after all. But what I hate is how people try so hard to justify it. The irony is that this visceral rage against the criminals just shows that these people have the same anger and violent tendencies lol. Funny how they try to claim moral superiority while doing this. They want to let out their violent urges in a way that makes them feel justified about themselves, or morally superior, which is just funny to me. It's just cowardice and conformity and being ashamed of who you really are.