People don't stop being trans because you disagree with them politically. I despise Jenner and other high profile trans grifters but I'm not shitty enough to deny their identities.
Do better. As a user of both sites this shit is genuinely upsetting. Despite how you may feel about hexbear, how can you claim that they bait people into revealing their internalized transphobia and then turn around and make shitty claims like this? I don't give a shit if you call me a tankie or red fash or whatever, but I'm trans whether you like me or not.
Unless Hexbear was defederated by everyone as a whole, or squashed out of existence I don't feel like discussions about it are going to stop any time soon, which kind of sucks because they do get annoying, but I do know they are important since those things haven't happened and hexbear is still out there causing problems, it's important for people to be aware of it, especially when picking instances.