Progressive Christians in the main are extremely vulnerable to this kind of bad thinking. They threw any kind of serious scholarship out the window 50 years ago and have at the same time a strong sense of the need for radical love (which is good in itself) but what that means is driven by secular culture and what makes them feel good. It's not a great combination.
Biut - aside from this trauma question, and we don't really know what is involved with these specific kids, it is absolutly and completely normal for teenagers to feel out of place in the world and try and shore up their sense of self in various ways. We all know that teens try and build a persona around things like clothing styles, music, changing their names, that they are obsessed with things like personality tests to tell them who they really are, or they want to be a preppy kid, a jock, a goth, they read dystopian novels and write bad morbid poetry to show how bad their lives are. It's so common it's unremarkable, especially among girls.
One new way of doing this is to adopt an weird, but not too weird, gender identity, say they are pansexual, get a medical diagnosis, become an activist for the oppressed group they now belong to, change their clothes and hairstyle, be affirmed by their school LBGTQ+ group and the internet.
Of course this appeals to the same teenage kids who were attracted to punk, goth, grunge. I'm not even convinced that growing up to be gay or lesbian is anymore an especially common characteristic of this group, as it seemed to be a few years ago.
The really important point though is that the dedication to these labels is typically something kids grow out of, even if they keep listening to the music, or have some stylistic preferences. Maturity isn't about seeing yourself through that kind of lens, it's about realizing that we don't need these kinds of labels and that they tend to be a rather shallow way of looking at the world.
The fact that adults are affirming this stuff is crazy.