Propose defederation?

It seems like every user on annihilation.social is a racist idiot, and indeed seems to be the entire purpose of that instance. Who do we talk to about starting a discussion on defederation so that they can't use lemmy.world to spread their vile hatred?

For example, one is referencing the Protocols of the Elders of Zion like it's a true thing and the other is talking about how God hates race mixing.