Because a character being gay or lesbian is not progress for them since homophobia and representation dont concern them. They use the gay and lesbian community (because no other people would entertain them) to push for their own identities under the guise of "we're all in it together", even though gays and lesbians have to serve them the most.

So the straight gender specials will begrudingly accept a lesbian or gay character but it better be an asexual (to accommodate the straight girls), a trans (for the transbians), in a wheelchair (to accommodate the disabled who, im guessing most of you are unaware, but theyre slowly starting to identify as queer).

So in the end, the only representation gays and lesbians get is this: A black "lesbian" with no arms or legs, in a wheelchair, who's also trans and also asexual. And this representation is somehow supposed to enrich our culture and relate to young gay and lesbian kids. This is what intersectionalism is.