I work with a guy whose wife hits him when she's in a fury (nuts I think). He is a great big guy, and the other guys in the office think it's funny. Why that's funny to them I don't know.
Women who feel comfortable hitting the men in their lives often deal with their children the same way. Most men can handle (but shouldn't have to) the physical abuse from a woman. The real danger is how she treats a 4 year-old.
I know a guy- two-service veteran, can handle himself, who had to put up with that. To his credit, the most he'd ever do would be to fend off her attacks. She'd use weapons on him- things out of the kitchen.
Man attacking woman, woman attacking man, it's all the same. I hate that crap with a passion. If it happens one time- it's time to get out. There's nothing funny about it at all.