That actually came later. It started right out of the gate with pedo rights advocacy. Just read up on early gays rights icons like Harry Hay. Many of them wanted pedo rights, too. Some of them considered the less radical "just want to get married" type of thing that eventually gained transaction with normies to be sellouts, basically "house niggers" but for gays.

My personal theory is that LGBT movements toned themselves down temporarily in response to the AIDS crisis. They needed help from normies to see them through that. Now that it's relatively controlled, and we're all paying for their degeneracy via various private and public health coverage, they're once again emboldened. There are other reasons degeneracy is approaching an apex, but I think this is a factor, too.