I just keep on driving...usually ignore them.
I have tapped the brake pedal with my left foot just to trigger the lights...still maintaining the same speed.
Last weekend it snowed here; we got about 8" when all was said and done. Roads didn't get cleared for the most part till after it had finished snowing that night. I had to go to a friend's house to let their dog out (was watching the dog all week) that evening. On the way to their place, with about 2-3" of packed snow on the road, there was this idiot in an old Escort flying down the road, riding up on everybody's bumper, and then going around them (mind you, it was a 2-lane road with no passing zones around). Couldn't believe this jerk...kinda woulda been nice to see him spin out of control and end up in the ditch.