Nah, the people who are obsessed with calling themselves these things tend to be heterosexual, not bisexual. It's women who are attracted to males who identify as men or non-binary (or something like that). Two genders, one sex. I've seen it all the time all over reddit. And some of these heteros do use the word "bisexual" for themselves.

I think I'm going to have to make a master post on this because I truly think you guys are underestimating how many of these LARPers are just bored, lonely, unattractive straight people, and you need to have the examples right in front of you. Actual bisexuals don't need to fake their way into an LGBT social group.