That's exactly what these esoteric genders are, IMO. Lots of teenagers spend a lot of time thinking about their own identities and what makes them unique. Only a teenager could think the minutiae of their gender identity are interesting or important. Mocking this sort of thing is more-or-less the same as mocking a 14-year-old's angsty poetry. It's just that now, with anonymous social media, people are communicating in mixed age groups where anyone could be a teenager, but reading everyone as though they're at least young adults and judging their comments accordingly.

Of course, there's the issue of adults encouraging kids into this sort of thinking with programs like the Genderbread Person. And it's also diluting the LGB movement when adults take it seriously. But it still feels as though mocking, say, the one teenager on Earth who identifies as a voidfluid dreadsexual is probably a waste of time.