Speaking as a lesbian who, age-wise, is right on the border between millennials and generation Z, there is SO much social pressure to be a TRA, it's scary. Just to give an example: my first year of college, at a women's college, I attended a meeting of one of the campus LGBT organizations, and I was shocked to realize I was LITERALLY the only person in the room who did not identify as transgender or non-binary. This group, and on-campus activists in general, spent so much time talking about how "cis women" were evil, transphobic, and literally murdering transgender people with their transphobia, that pretty much every single not-straight women I knew came out as non-binary or transgender over the course of their time at college. I think it's in part, because they don't want to be seen as the oppressor and identifying as non-binary or transgender means they would be the victims, and in part, because in many places this gender ideology nonsense has pretty much taken over the entire LGB scene so if you don't believe in it you are not welcome in LGB spaces and you will likely be stalked and doxxed. More than anything else, believing in gender ideology as a young LGB person is about fitting in in this extremely strange subculture. So even if you don't really believe in it, you set aside your reservations, and you either convince yourself that you really do believe in it, or that the latest trans woman activist that's trending on Twitter knows more about it than you so you should just shut up and listen. That was my experience, anyway.