I don't get anything I would call "road rage". But probably because Tesla's have performance right up there with the fastest of them all, car enthusiasts who have built their car or truck with performance parts to gain performance have a heightened sense of what a Tesla is, how fast they can accelerate and that many of them are faster than their cherished baby they have put their heart and soul (and a lot of their paycheck/inheritance, etc. into). About the only way they know how to respond is grab neutral and rev the engine to near redline briefly. Since they have performance cams/exhaust this is pretty obvious, even if I have the stereo on pretty loud. They can see you coming from the front in time to do this even if you're both going around 35 mph. They also do it if they pass you in a lane on your left. I've seen it about a dozen times in the previous 9 months I've been driving Tesla's. They obviously feel threatened and it's the only way they know to respond.
I liken it to a peacock's mating ritual, a show of potency that is the natural response to competition. If only they knew how silly it makes them appear. Actually, I suspect most of them do know how silly it makes them look, they just can't control themselves.