Once people started coming out and homophobes realised that their kid/bestfriend/bartender was gay, the smart ones realised "oh well, them being gay doesn't affect me, guess i'll stop actively hating gay people".
It's a lot harder for a racist to challenge their preconceived notions that people from other races are prone to violence, want to take what is yours, etc.
I've seen it, and i am aware of the intersection. After all one of the most popular drag queens is RuPaul. That doesn't change the fact that African Americans as a whole has had a much rougher time in general, throughout history in this country.
Who had it worse though, African Americans or Native Americans.
Why bother with Oppression Olympics when you're competing for who gets last place?