Sure, the world is not black and white, you can always twist things around and mince words to support any viewpoint. But you picked a bad example, because the argument with abortion is that the unborn baby has rights too.

The only way you can say gay marriage violates someone's rights is to say that people have the right to not be offended, or the right to hate people who are different from them. For all the contortions that people will make on this issue, it's fundamentally about fear and hate and nothing more. Abortion is a much more nuanced issue.