I've have shaken my head at a driver on the phone - and on a couple of occasions asked them to get off the phone. I think if we ignore small rule breaking then the rule breaking moves up a step, for example - bad parking ... where is the harm in that... well today a car and a van were parked opposite each other leaving a 1 m if that gap in between for my bike. I assume the van was just making a delivery but he could have chosen to park 40 meters either side and not blocked the road completely. We seem to be loosing the idea of consideration to others, its just all about me, me, me now.
I hope your lip gets better quickly and that the idiot goes on to feel really bad about it - like you say I doubt he is going to get caught this time ... but maybe on his next incident he will be caught if you have such a temper that you hit someone when they tell you off.