OK, first time I've seen the dread Hexbear brigading in action. So, thanks, I guess?
Now I understand why they warrant defederation. I'm glad on on a Lemmy instance that defederated them, and suppose I'l have to find a kbin instance that does as well (apparently this one doesn't defederate them if I'm reading this correctly?)
The irony is that, although I've been in the fediverse a while, today I literally made my first kbin account.