bi lesbians are real and have been written about since like 1970 and you can die mad about it.i will fill this out properly later but for now here's ur food for thought:
1) systems who use a "general" identity label that's a combination of everyone's identity exist and deserve to use labels
2) fused headmates (people in systems who are the result of two or more headmates combining/fusing) exist
3) multigender people exist and deserve to use labels. multigender people who are both a man and a woman exist, and they have the right to use labels that suit them. they should not have to be made to feel like they can't call themself xyz because they're x gender. you either support nonbinary people or you don't.
4) people with fluid attraction exist. they should not have to be made to feel like their label choices are wrong
if you get off twitter you will find that MANY adults use labels like this. these people are real. they see your exclusionism and they know the community is being made unsafe for them.there's a web archive of the old carrd with this url here, i've no affiliation with that person tho so i can't do anything about that carrd