There is no singular LGBT movement. Perhaps there never was one, and I do not believe there should be. Therefore, resisting assimilation as a group function is pointless. Those who espouse assimilation and those who would resist it will inevitably create an atmosphere of gay-centrism. Either would place limitations on diversity within the community which are contrary to a pursuit of real liberation.
Humans are social animals and instinctually want to belong to the larger, dominant group.
We also desire to be unique within normalcy. That is, we want to be special among our peers. They pushed the envelope of tolerance by making people so uncomfortable with their tactics that anything slightly more subdued was almost welcomed. Their weapon of first choice is sameness. Both of these approaches have had limited, if not arguable, success.