That's not true at all. Extremely wrong. LGBT people are not more affluent than average – they are actually less so. Most pride parades are largely working-class people. Where I live (Texas) my local pride parade is heavily people of color (Hispanic mainly) who are not particularly wealthy or anything. I think you are basing your impression off of a media-generated image and not the reality.
Marxist Texts About Fascism
Cameron Johnson
Liam Johnson
No, there are a lot of studies that confirm this. Homosexual couples are on average noticeably more affluent than heterosexual couples.
paulcockshott.wordpress.com
Xavier Ross
Read the comments questioning Cockshott's assumptions in that article. He's talking about gay men specifically – you wonder if there is some self-selection going on since professional gay men are more likely to be out and will participate in such studies. Then he said the "LGBT movement is a middle class phenomena." But then what about transgender people and lesbians? Some studies show LGBT people more broadly defined have much higher food insecurity and poverty rates than the cis, hetero population:
theatlantic.com
Anecdotally, as someone who hangs out in gay bars and goes to pride parades, the idea that this is a middle-class phenomenon is laughable to me.