...I'm talking about cases where the person in question is complaining about the prejudices that do apply to them and get shot down for stupid reasons like that. And no, I'm not "generalizing". This is a thing that fucking happens, and it is gross, and this is the first time I've ever seen someone use this sort of line without blatantly intending to attack the "less oppressed" group/person.

But who the fuck says that? What most people I've seen say is that it fucking sucks that they have to not only deal with homophobic straight people, but they are often mistrusted or even shunned by queer people just because they aren't monosexual. No, no one should say they're "more oppressed" (honestly even a group who is shouldn't be saying that because who fucking cares, all oppression is bad), but that....isn't really a huge problem. People are just interpreting "it fucking sucks that both straight and queer groups shun me" as "weh weh I'm more oppressed than gays and lesbians!" which. Isn't what that means.