If we're saying we took Biolgy, we could read a lot of other books too. In Biology, the science is very clear that gender dysphoric people may have significant differences, say in comparison to heterosexual biology, in fields such as: hormones, brain development, psychology, body shape, and others.
People hang onto the xy thing like almost - meme trolls, who ran out of worthy argument a long time ago. And now only really have vicious adhominem assult, and some quarter facts. It's sad.