Yep, that's why that admonition to love those who spitefully use you is so difficult to stay in line with. I've always been a man that's willing to find a diplomatic solution, but if I get physically attacked, the fight's on.
Yeah, but when you pull your pants down to offer that cheek, someone usually calls the cops. (FYI - claiming that you were simply turning the other cheek won't get you out of an indecent exposure citation.)