I feel like when people first started using that term it meant "doesn't have any real interest in sex, libido pretty much zero" and now like most things words mean whatever anyone feels like at the time.
Oooh oooh I remember this one! It got explained to me when I tried pointing out that biological females seeking out sex with biological males weren't lesbians, but bisexual or hetero, depending on if sex with other biological females was involved.
The answers I got were something like: if someone likes and chooses the name and identity of lesbian (presumably because of how it feels to them to present that identity to others since it obviously isn't a factual description) then they are lesbian. No, it doesn't hurt lesbians when their definition is forcibly reoriented for them, and isn't disrespectful or appropriative at all. (A lot of shut up, shut up, la la la la, you're wrong and those people don't matter anyway kind of posts at this point). And then I got called homophobic for trying to insist that homosexuality involved, you know, actual homosexuality.
So there you go, you're educated! Be a vegan who eats steak, be an asexual who likes it five times a night, enjoy your cosplay
And bugger the people left damaged in your wake of course, because they're just wet blankets.