leave a little earlier, drive a little slower and youll live alittle longer.
(it can be annoying if people attempt to cut in, while youre patiently in line, or at a red light theyre in the outside lane ready to race and (illegally) change lanes in the intersection, cause theres a parked car coming up., change lanes about 10times in one block, all without signaling (and yet end up behind you after a few blocks - it can be annoying if you let it annoy you.
Id say resist the temptation to box someone in, or slowdown if they are tailgating you, or turn on your highbeams if you are tailgating them - Its not worth getting into an accident to prove a point. (or getting into a scrap either)