At 6'3" 207lbs the only person who tries and gets away with that sort of thing is my wife.
Just reading this is infuriating, though. I think I'd actually separate the bastard's hand from his arm if he tried that with me. Then, if I was feeling benevolent, I might treat his bleeding stump, carefully package the severed hand for transport with him to the ER and calmly ask if he's learned anything and how attached he might be to his other hand.

Seriously though, that's an astounding level of ignorance and hostility that you're being confronted with. My hat's off to you for maintaining your composure.

B.