I sometimes look at the Trans UK subreddit for research or laughs, and sometimes I can't bear to look.
As far as I can see there's a divide among the posters there with a majority of mostly young, sometimes very young, TIFs with extremely poor mental health. They're mostly looking for support and, I fear, looking in the worst place.
And there's a minority of creepy uncle TIMs who very much dominate.
What holds them together is the fanaticism, the catastrophising about trans genocide etc.
There's an incel vibe, but I'd be even more specific and think of the incels' beef with the Pick Up Artists.
Don't get me wrong, I'm not defending the PUA scene, much of which is rapey as fuck, but its target market is lonely men who believe there's something they can do to improve their situation. At the milder end it shades into the legitimate dating advice community.
It seems to me the incel scene is full of young men who either don't have the social skills to improve their situation, or are just too lazy, and they wallow in their social ineptitude. It's become their identity. And they hate the PUAs about as much as TRAs hate detransitioners.