I'm not really sure how you'd measure it exactly.

I believe the amount of discussion about it online could be more of an online phenomenon that might not match the degree in real life. I also think the fact that it gets discussed a lot in gay discussion groups would actually be a somewhat positive sign as it would mean it's recognized enough to have a discussion, rather than just people denying its existence.

I'm in SF and I haven't seen an agreed-upon overall racism going on, even though I've run into individual cases. Even those examples I can think of weren't "I don't like [race]." Instead, I've seen more casual or flippant disregard for racial minorities from a perspective that seems like and unconsious, "Being gay's a minority, so as a minority I can't be racist like other people can."

Leaving out the mess of racial preferences on hookup apps, I think the focus on white gay men is more of a problem of how a majority that gets all the benefits of that tends to have the resources, advantages, and confidence to just take charge and get themselves heard easier. It's one of the reasons we flipped GLBT to LGBT since gay men had such an easier time becoming the spokespeople and leaders of the movement that the ladies representing the L felt like they were getting back seat too often. We have to deliberately adjust to compensate for society at times.

I don't know about dropping out completely for that though. If everyone that feels that way drops out, nothing ever changes or represents the people with those concerns. Better approach would be to get involved with the parts of the community that are doing it right and contribute there.