you could hear it come out of sanders' campaign near the end, this completely data-ignorant perception that he got sunk by the gays.
if there was any truth to it, it was that he didn't do any outreach, and threw one of ten voters away because of it.
but, the more realistic reaction is that his campaign was just run by a lot of bigots that swallowed a lot of republican talking points from the 1970s, and refused to do proper research into actual, real demographics. if the campaign had actually understood the demographics, and actually resourced itself properly, it might have at least given biden a better run...
but, it was easier to blame it on the gays. it always is.