activism is a space where your sole purpose in functioning as a community is about making the world a better place, and thus it's doubly frustrating when someone's behaviour or person interferes with that

It's not just that the behavior interferes with it, it's that the behavior directly perpetuates the power relations that are purportedly opposed by the activist grouping. I'm sure there's some similarly toxic shit that goes on in Tea Party groups and makes it more difficult for them to function, but at least there it's not seasoned with a generous soupçon of hypocrisy.

If I can ever figure out a way to write about the far left in such a way as to not sound like an anti-communist, there's my novel.