I do the same thing. If I'm in the left hand lane, I stay a good 3-5 car lengths behind in fast traffice, but if I see one of them thar hotheads racing up behind me in the right hand lane; I close that gap so they can't cut in.

It's annoying if you have your cruise control on and you have to break and reset for them.
Another annoyance is moving along with traffic in the left hand lane, getting ready to pass some slow moving car on the right. And some boner in a black SUV with a grill the size of the road comes RIGHT UP BEHIND YOU and rides your bumper while everyone's driving 70 mph. (or more). They piss me off more than anyone, and I'll usually slow down and hit my brake lights and start hollering at them in my rear view mirror.

Generally, THOSE are the ones who have a lot of road rage and I've been flipped off by them many a time. On a long interstate drive once, I found one rolled over about 10 miles up the road. Obviously his impatience got the bettr of them.