Well, I'll drop it after this as I've clearly ended up getting more serious on this than was intended by my initial response. We disagree and I think you're rationalizing taking retaliatory action simply because you were annoyed and felt it your job to teach him a lesson. Sounds like the beginning of most road rage incidents you hear about.
The most likely outcome may truly have been bumped shoulders (which is still more than the guy deserved, and also an assessment of your skill at almost, but not quite, hitting people that will just have to be conceded) but another outcome now significantly more likely in the situation you created than if you'd just given as much as space as possible is a sudden poorly timed last step that has you simply running him down.
But I'm worn down. Good job, you were a dick!
Your brand of street justice should inspire a TV show, perhaps starring a young, less asphyxiated, David Carradine.