I've encountered that a lot too. When it happens now, I just deck it. Have to look ahead and behind to make sure the police aren't in the area, but I just bury that kind of turd in my dust.
On another note... my worst traffic nightmare was going westbound on the GWB. We got to within 5 miles of the bridge when traffic came to a complete halt. They had closed the upper deck for emergency repairs, so all traffic was funneled to the lower deck. It took five hours to travel those five miles and I do not exaggerate the time or distance one iota. That was absolutely the worst jam-up I've ever been in, and I've driven through LA at rush hour and around DC and Richmond a fair amount. The second worst jam-up I've ever been in was another time crossing the GWB and a two hour back-up on the Cross Bronx Expressway. I will never take the route again... ever.