I live in DC and around here motorists aren't exactly friendly. There's definitely an us vs. them mentality around here.
Anyway, I've learned to develop a thick skin. Id seems insane to me to actually stalk someone (as one of you has written about above) because they pissed you off on the road. What if that guy comes out of his house with a baseball bat and you're stuck in the dead end? You really think you're riding out?
They drive CARS! Cars can kill you. Easily.