Saw things like that when I was back in fandoms. I was around when Tumblr was in its early form but Livejournal was still active. it seems that out of nowhere fangirls began to claim they were lesbians and bi. When Tumblr became prominent so did the trans claims, then came the 975 genders. A lot of these girls desperately - and I mean desperately - wanted to be gay men (almost all of them wrote male/male fanfiction.) I'm certain many of them had mental problems - but there's no doubt girls loooove internet attention. The more freaky labels you claimed, the more attention you got. The more likes. You became a superfan (yes, that's a thing. There are famous fangirls).