My mistake was explaining my other beliefs when asked.

You did not explain your position on gender, in a sub called “gendercritical” (not “transcritical”). For example, when just_lesbian_things wrote:

If you think there's more to being a woman than basic biology; if you believe in gender roles or other ridiculous gender propaganda then you're no different than the crazy trans males you claim to be against.

...you could have set out your views on gender. But you didn’t, so don’t blame the group for reaching the obvious conclusion that you are no different from conservative men in general.