It's my experience that the man firmly believes he's right even when he isn't, and no amount of reasoning from a woman will change his mind. It'll just put his back up and he'll say things like "Why do you always have to argue?" and "Oh, yeah, you're always right!"

Weeks or months later, they will come in and say "Did you know I was wrong about ___? So-and-so told me." So-andso is always another man, and the man you argued with will never remember that you told him he was wrong - just that you're always arguing: poor him.

There, that's my stereotyping contribution to this thread!