I think you can get in serious shit with the law cause of desieses that can be spread through saliva. This being said, I would flip a switch and come out swinging, talking is one thing, but spitting in my face, hell no. I'm not the strongest dude and I'll probally lose, but I'd make sure I for a couple of punches in so he knows if he wants to start shit, its not gonna go over easy, but props for staying cool, smartest thing you could do.