Just anecdotally my Dd's friendship group (15 yr olds) is a mixture of 50/50 girls and boys.
There's one Trans boy in the group who been 'trans' since 13. Wears a binder but no medication. They all call him 'he' because he just passes really well. It honestly feels right calling him 'he'. He's not very vocal about being trans, it's never a big part of the general conversation, he just honestly gets on with things. Out of the whole group he seems one of the happiest. However I'm aware I only see a small part of things.
The rest of the girls are 'straight' hetro-normative currently.
There's one boy who says he was gay, then bi, now not so sure.
One boy announced he was a-sexual but that's just fizzled into nothing.
One time my dd announced to me that she was boring because she'd realised she was only 'straight'. What a weird state of affairs!
My DS's friendship group is currently all boys (13 yrs) and not one of them has expressed any interest in gender fluidity (yet).
No point to this post really. I guess I'm just thinking aloud.