Where I grew up, the saying went "there are three things you don't talk about in polite company: money, religion, and politics." Where I used to work, I found out someone I worked with a lot didn't support gay marriage. I had a really hard time working with them after that.

Maybe this is the inevitable outcome of trying to make work a social hub. It's great to say that we should be able to discuss anything with anyone, but the reality is that we're not all perfectly mature people and we can't handle it.