Actually I just stumbled upon it, wasn't very hard at all. Don't care if the conversation is three years old, wasn't that long ago. Anyway, don't try to backtrack now. That person just said "What irritates me is that some gays whine and bitch about how "hard" their life is when we all should remember that there's sex trafficking, world hunger, etc. It ticks me off." ....And what was your response? "Wonderful comment!". That's what you said. You didn't say "They are perfectly welcome to express their frustration over it". That's not what you said to that person. Another thing, LGBT people don't act like they're the only group in the whole world who is dealing with bullying and discrimination. NOBODY said that they're the only people going though situations like that. NOBODY.
As for racism, it's not rude or ignorant to equate homophobia with racism. Different topic, yes, but there are similarities. We live in a society where black people, gay people, women, etc. have all faced discrimination all around the world in various of different ways. Different topics, different issues...but they all have something in common: Groups of people dealing with prejudice and discrimination because of how they are born. That's why there are comparisons in discussions like this.