Are they cis guys who are attracted to trans women but don't know how to process that in healthy ways so it comes out in transphobia? Are they just transphobes and they get their jollies out of being straight up sicko creeps? Or something else entirely? I'm just curious as to what makes them tick.
There is a sort of pipeline for the porn that leads to this behavior. Shock humor -> Habituation -> Testing the Waters -> Ironic Acceptance -> Negotiating Unironic Acceptance -> Embracing Fetishization. There's stuff out there mostly meant to troll people not into this stuff, and then catch and subsume them into their weird little community so more content gets reposted or commissioned.
Weird that they enforce the cycle of abuse and trauma by checks notes showing each other trans bodies