If states don't allow gay marriage, as part of their duty to support community standards, is it discrimination? You could construct an argument that it is, but you could also construct an argument that gay marriage is destructive to the moral fabric of a community. Personally, I don't give a **** about gay marriage. It's none of my business what others do that don't affect me however the structure of your question is based on prejudicial language. The Logical Fallacies: Prejudicial Language Therefore to address it would be arguing against a logical fallacy.