To them it probably means "people who don't let anybody else know they're gay or publicly defend the LGBTQ community, so that we can pretend gay people are really rare and don't exist around us"
Reminds me of when Colbert had NPH on the Colbert Report. They are talking about NPHs sexuality and I forget what prompted the quip but it was glorious. Something like "and that's why you're one of the most threatening gays because of how non threatening you are."
That's kinda what I think they mean by "normal" gay.