This is not the act itself that upsets you, but the people doing it.
The difference is that when a man loves a woman, potentially, a baby comes out later on. When a man "loves" a man, what comes out is brown crap, some blood and white sperm. Later, one of them will proudly tell all of us that he now has AIDS. Which will make him a hero and a celebrity if he is already known well enough.
My "bigotry" is based on the simple fact that the a** f****** brought this mess to the US from Africa and Haiti and now we have to pay big bucks for the AIDS "research" and to keep them idiots alive, which ain't cheap.
If you don't want to see, don't stare.
You can apply this idiotic remark to anything, including a hetero couple f****** in public or in a restaurant where normal people take their families out to eat without gagging.