Tavix saidThe essence of this question does not rest in the preference of an individual. For instance, one can prefer blue instead of green. But the ill meaning of discrimination lurks in the actual causation of a person to degrade, belittle, or feel superior to another human.
I don't really see what you're getting at, isn't it clear that people have an inherent tendency towards racism in general?
Not sure why gay people would be any different from straight people. White people have been racist towards black people, unless you live in Zimbabwe, then you better not be white. If you're a Jew you'd rather not be in any Arab country, and if you're Arab you will be discriminated in the bulk of Western Europe.
People are just racist, you too, me too. Get over it and try to not get your inherent bigotry in the way when dealing with individuals. Once you deal with a lot of them and realize that douchebaggery transcends any race or color you can train yourself to suppress your inner racist and wait a minute before judging somebody.