I don't think either secret was saying that lesbians or asexuals don't exist. (I got the impression the lesbian secret was posted by a lesbian actually and who knows maybe this one was posted by an asexual.)

I think what the secrets were saying isn't that it's bad to be a lesbian or an asexual just that people who claim to be one when they aren't are irritating. personally i don't think that attitude is fair because sometimes people really are genuinely confused, but at the same time it's not the same as saying "lesbians and asexuals suck and none exist".