Sexuality is not an identity. If you are bisexual you are bisexual, even if you call herself heterosexual, or lesbian or gay man, or anything else. Your words would not change material reality of who you are. And the reason that people still ignoring reality and agreeing with whatever people say they are - hurts actual lesbians (and well - all other minorities).

And - a lot of lesbians are hating bisexual women just for that (I myself fine with bisexual women, my first gf was bisexual), and it creates bi-phobia withing the community. When bisexual women are saying they are lesbians and then dating men or never even dating women, but just saying that they are lesbians. And then men are oming to lesbians and saying - hey, that woman who always dates men is calling herself lesbian, so come and try my dick, you just not found correct dick yet!

And it is not even QT problem, this was long before QT. It is mostly porn problem, porn makes "lesbians" sexy for straight men, so even straight women can be called themselves lesbians or kiss another girl while men are looking to "be more hot for men and sell for more".

And from what I've seen in those communities, many of them aren't lesbians. Like non-binary woman who is dating feminine man who is non-binary too are calling themselves lesbians, even thought they never had any relationship with woman and never even kissed a woman.