I don't think I really need to explain much, their admins are transphobic. 
https://hexbear.net/post/1587342
Snowe, an admin, complained about a transgender person being offended over being misgendered. Ategon made an apology post but keeps snowe on, no public apologies from snowe to the transgender people affected.
Textbook 
note: conversation about Ategon's use of the word triggered edited out, might be misunderstanding, need clarified
The blahaj defederation thread is absolutely chock-full of seething about Hexbear, which is very funny
I think the funniest outgrowth of federation is people getting extremely fucking mad that other people are posting and replying to them about their dogshit opinions.
Ummm excuse me that's called a brigade, which is a real thing that everyone has to pretend to take very seriously
"um actually the completely empty bar atmosphere we've been cultivating is actually our site culture which you are imperializing by settling your posts here"