It's whatever the fuck the person applying this made-up gender to themselves feel like on a certain day. They want the oppression points that come with being LGBT without any effort.
Think about Sonicfox, a sex-obsessed faggot who's now adopted the "nonbinary" moniker while still presenting himself as male, and making no attempt at androgyny. He only did it so now people have to walk over additional eggshells when talking about him, lest they be swarmed and attacked by his rabid furfag fanbase for not using his "proper" "they" pronoun.
It's basically something to give uninteresting people a "personality".
"Neurodivergency" is such bullshit. People can who claim to be "neurodivergent" or "neurodiverse" and be prideful of being neurodivergent are legitimately privileged. They're the forefront, the public image of developmental disorders like Autism, and their word discourages research from being done into said disorders. They completely ignore every low functioning autistic person, who hit themselves constantly, live in a 24/7 state of sensory hell delirium, can't speak/only verbalize through screams and murmurs, and are literally unable to live normal lives without the assistance of others.
But no, Autism is just cute and quirky! Look at how many genders Aspies "creative" brains can come up with! "Lawl I can only empathize and relate to other human beings through fucking pokemon and cartoon horses, aren't I adorable?? Respect the stim!!"
At this rate, these disorders will never be taken seriously. DID/MPD is something cute you throw on yourself nowadays because it's trendy. So are AVPD and NPD. God forbid ever trying to fix or treat this shit, no, change the world around them to fit whatever distorted views they have about it! It's your job to make them feel good!