Well done for keeping your cool. Pity you don't have dash cam footage..I'd have plastered this moron all over the net. Please report them to the police so it goes on record - with such a pathetic moron attitude they are bound to get themselves collared sooner or later. Or maybe they'll argue with a tree and rid the world of their stink..good riddance, considering the risks they pose.
The driver of the red Honda looks as though he may suffer from some kind of learning difficulty.
Whilst that is absolutely no reason to mock him, it's also important that the police/authorities are made aware of this incident, and reconsider whether or not he possesses the mental capacity required to drive a car on public roads.
The footage of this incident starts at 7:04 for anyone that's short on time.
What's the backstory? Clearly this person is not fit to be on the road, I would suggest you report to the police and provide the video footage as evidence.