Oh, this one comes up a lot! I regularly disagree with friends about things like this, and, by and large, it's fine -- unless they get sneery, which tends to make me snap. Acquaintances I have been known to walk away from, if it *really* matters. I can agree to disagree on a lot of things but there are handful -- racism, for example -- on which I won't.
I expect to be disagreed with. That's part of it. Other people's opinions matter and I try and listen carefully. (That's a principle, in fact :-))