How do you gracefully opt out of an argument?

I have a lot of opinions and, fortunately, am right about everything. This causes problems when I meet other people who think they’re right about things but foolishly disagree with me. I am constitutionally incapable of gracefully walking away from an argument. How is this done, exactly? How do you nip it in the bud, or abruptly end it without admitting defeat? Is this possible?