I can't speak for anybody else, but I was pretty homophobic as a Christian, and became tolerant of gays after getting rid of religion. I think I see gays fight for equal rights and acceptance as a parallel of atheists also fighting for acceptance (and in some cases equal rights). Plus anything to piss off the Christians is OK in my book.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.