(one major indicator of identity-focused labelling was the switch of "bisexual" from meaning "pangender" to "pansexual". this was, imo, not the cause of, but emblematic of a shift from "gayness is a kind of cultural mode" to "gayness is something someone is")
as the mother of a clueless someone who wrote a terrible autostraddle article said "i've never met anyone who does both things!" - you know, because she understands that gayness and straightness are cultural contexts you find yourself in.
@xsssm the conclusion of “Imagining Transgender” by David Valentine goes all in on critiquing gay men for manifesting this shift and anyway yeah i agree