Feminism seems to be an extreme case. Not as extreme as "trans" but getting there; an absolute refusal to recognize allies from outside the group. I've seen it hundreds, maybe thousands of times; feminists who sneered at all men who claimed to care, no, you can't possibly know what we go through, privilege, patriarchy, blah blah blah. OK fine, fight your own battles, I tried.

With the "trans" there is no difference between 99% supportive and dropping the Zyklon-B.