So does that mean it's fair for heterosexual people to assume that random queer people are engaging in the same acts as those glorified by the more prurient members of the Queer community?

Would you similarly be saying that it's fair for Black people to judge White people ("as a group") based on the actions of David Duke and his acolytes? Or for women to assume that any man whom they encounter necessarily subscribes to the beliefs of Andrew Tate?