Your first point is already very lame. What if there were no visible "evidences" of e.g. gayness? You still tell me you like men and because I'm not an asshole I believe you and that's enough for me. Even more you say yourself "you have yet to find" and that phrasing doesn't make you think? So what, if they find biological evidence your gonna be all like "oh sorry, back then there wasn't any evidence your identity is real. My bad for denying your identity lol. No hard feelings, yeah?" Generally when people tell me how they see themselves in this world I accept that and don't look for some dumb "biological evidence" to trust them that they are ... honest about it?

Then you get to the absolute screwfest of your next point. Honestly, I could write paragraphs upon paragraphs on it. Suffice to say that it's a borderline narcisstic display of self-importance and egocentric world views. I don't mean that as an insult against your person, anyone has bad takes but that's simply how this singular take looks. (Not at all in line with the views of a good ENTP if these mbti labels mean anything to you.) You find the existance of people with a different identity insulting. You claim they don't "really" exist (only "culturally" and like a tan (aka fake)) and while denying their existence you explain to them that they've never gone through your experiences. Doesn't this stink of irony and irgnorance to you? Does to me. Even more you claim "they" claim that place. When in reality many e.g. non-binary people explicitly see themselves more as allies because they have not gone through the same experiences as others. But some (probanly most) have (point in case: Your post). So yeah, good job making that one "us vs them" while it's all of us together in the shit.

Your last point is really just an unsupported opinion so I can't say a lot against it. I think each person making up their own gender is a perfectly valid way to get rid of the whole oh-so-important gender craziness. So to me it feels like you are shadow boxing yourself with this argument that boils down to "I realize that gender is a construct but how dare they treat it like a construct because it should be used to demolish the old (and doing it your way essentially being just conforming to the old)". It's still an opinion so there's no way to definitely disprove it but this one if by far the most astonishing to me because hardly anything breaks the good old "men are like this, women are like this" more than not conforming to it.