Society as a whole determines what is socially acceptable. I make no attempt to define society, and would argue that you have small societies that are parts of larger ones.

It's also not socially acceptable to be fat and that's not fair either. Not to go to another topic, but homophobia is not the only thing that people are prejudiced against. People have a lot of hangups, opinions, values, etc. Unfortunately the US, nor any other country that I am aware of is a utopian society. That's what dreams, fairytales, and theory are reserve for.

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When you get to the end of your rope, tie a knot and swing.