Yes. Tribalism. There’s a need to belong. And a good way to show that you’re a member of the group is performative demonstration. But there’s also a need to show that your tribe is superior to the others. We (humans) don’t really strive for equality, so much as we strive to show that we are not impoverished. And a good way of doing that is demonstrate that our very important needs and rights are more important than someone else’s stupid and trivial needs and rights. Punching down is a lot easier than punching up.
This actually happens with all subcultures. I mean, that’s sort of the entire point of a group demonstration of protest in the first place. It’s just that it’s way more obvious when the group has hegemonic power over another group. And more dangerous.