Uhh... But what about the women in GC who literally are mentally ill? Like, I have anxiety and have had thoughts of suicide before, which is literally mental illness, and luckily I've got help with it. I have family members with bipolar and OCD, and have supported a friend with an eating disorder. I'm very much for people getting help and therapy for mental illness, which doesn't conflict with my gender critical viewpoint. The only thing I'm not for is people rushing into surgery/hormone treatments for gender dysphoria without getting proper therapy first, for the mental health of the patient. With most mental health problems you should at least try to address the underlying issues first. The reason some people detransition is because they realise that instead of getting therapy for self esteem issues, depression, etc, that they were convinced that transition would solve their problems. To not get proper therapy before transition is unethical.

And what do you mean by anti-intersex? Most of the time the only times intersex is mentioned in GC is people saying they're tired of intersex people being used as pawns for TRAs. The only stance GC really tends to have on intersex people is that they generally have some combination of male and female sex attributes, and therefore aren't a third sex, more of a combination. That is scientifically sound unless you'd like to show me the third gamete humans can have.

I do think sometimes even r/gc could get into its own sort of echo chamber, but I don't think it's cultlike as TRAs. I've never seen someone on GC say "Oh, don't look at [trans sub]! That's a form of self harm!" to discourage people from reading any kind of opposing view. I've haven't seen GC rewriting Stonewall history, but trans subs will actively remove interviews with Marsha P Johnson that contradict their narrative. There's a reason that there were more GC that QT in the now banned debate subreddit, because GC was generally able to actually provide sources instead of just parroting whatever they'd heard in their subreddit.

Each side has their flaws but I would highly recommend you spend more time lurking on the s/gendercritical subsaidit if you actually want to know what it's about.