It's just that when we get flak, it's usually from everyone. We lack sexuality in a community that celebrates sexuality, and oftentimes, members of the LGBTQ+ community can be just as hurtful to us as any other group, especially bi/pan sexuals who are attracted to everyone and are unable to understand us. For straight people and gay people, we can at least be like "well how do you feel about x gender you're not attracted to", but because we can't use that example for them, they're often less able to understand us and can, in their lack of understanding, easily talk down to us.
We get told we aren't really asexual and there's just something wrong with us and we need help, we get every variation of "you just haven't met the right person yet", we get put down for rejecting people because they "might be able to fix us", we get put down for telling people we don't like or want sex and not magically changing our minds later on in the relationship despite constantly affirming our stances, and we get put down for not having sex because "you might like it if you try it", hell, sometimes you're even considered abusive if you don't want to have sex with someone. When we have sexless romantic relationships with each other or people who otherwise don't care about sex, we're degraded as "not having a real relationship" because there's no sex, and if we do it, either to placate a partner from a different sexuality or just out of curiosity, we get called fake because "real asexuals don't have sex" from the same people that talk down to us for not having sex to begin with. We're ill or losers for not having sex, and we're liars if we do.
We're an enigma to non-asexuals, and in everyone else's minds, that means we're fair game to talk down to, to treat as if we're faking it for attention, or we're somehow lesser. Honestly, I kinda agree we're the black sheep because everyone else is on one end of the spectrum and we're on the far opposite end, and honestly, sometimes I wish we weren't considered LGBTQ+ so we didn't have to put ourselves in increasingly sexualized spaces for the sake of "pride" that oftentimes doesn't consider us. With parades becoming more about sex, society becoming more sexualized in general, and lack of experience being one of the top insults people love to throw around, it's started to feel like the world is made for everyone but us.