I've come across this.
A (former) friend of DD's currently lists themselves as she/they.
They are a 12 year old child.
Not unrelatedly, they are also incredibly socially awkward, miserable at school, really struggling to make or keep friends, and generally an unhappy child who spends far, far too much time stuck in their room on video games and social media.
I felt sorry for them, until they tipped from a bit controlling with DD to outright emotional blackmail (you'd give up that hobby if you really loved me!) and then to frankly nasty bullying, including trying to message DD's new school friends and accuse her of being 'nb-phobic'.
That was around the time we blocked the kid.
It absolutely is attention seeking. This is a lonely child, who massively struggles with social interaction and appropriate behaviours. They're far from a bad kid, but lockdown did them no favours and they weren't given any real boundaries throughout, including doing no school work whatsoever. They appear to have gotten very used to having a lot of their own way, unlimited hours online, and re-joining the real world was and is a horrid shock. They're happiest online, frankly, in their echo-chamber spaces, which is sadly a common thread for kids like this.
But they bring the online into the real world and then can't cope when real people, particularly adults, don't react the way they want, particularly when it comes to attention-seeking behaviours.
When geek wasn't special enough anymore, they tried gay. When gay didn't work anymore for attention - and this was full-on pride flag wearing, 'are you being homophobic!?' levels of it (and, frankly, when they couldn't cope with even 12-year-old's level of reality that being gay means being attracted to the same sex) - they've gone for this.
It's absolutely a way of controlling people and the way they're allowed to interact with them, particularly their peers, because they're hyper-quick to shout 'phobia! hate speech!'. The measure of the self-centred came when they openly showed disability discrimination and stated that various disabilities are 'not a real thing' if they stop people perfectly and immediately complying with the gender-woo rules in place that day.
It's such a shame, but such is what's happening.