First you say...
Gay people have never experienced the maltreatment that blacks have in this country.
Then you come back with:
I never said that gays weren't treated badly.
Gays have been routinely beaten up and occasionally murdered for decades. Many have been rejected by their own families.
Freehunter is right, of course -- this is not about comparing who is the most persecuted, as if only the winner of such a comparison had the right to complain about it. It's about seeing prejudice for what it is.
I think that if you really looked at what a lot of gay people have gone through, you would not so facilely deny any similarity between that and what blacks have experienced. Of course there are differences; they are different situations. But there are also very substantial similarities. It appears that you don't want to look at the similarities, and I think you should ask yourself why not.
EDITED TO ADD:
You should really talk to some gay black people. The ones I have spoken to about this have all said the experiences aren't very different at all.