I'm glad you're okay and I agree with the others: it may not have been the best thing, but don't feel guilty about it. Maybe all the good stuff you've thought about saying (after the fact, of course) will come in handy one day, although I really hope NOT.

I also agree about calling the police, taking pictures, whatever you can do. My husband had a similar thing happen to him last week and he had a little "conversation" rolling side by side with the male driver (who was accompanied by a woman passenger whom I'm sure was not too impressed by the driver by then). He told him that he had his license plate number and would call the police and the province's insurance corporation (they keep tabs and eventually increase your premiums if you look like you're a risky driver) right in if he didn't apologize... which, much to my surprise, the guy did (fumbling, but he did it).

Good luck and keep the rubber side down.