Re: Shouty men...
If there is no place to pull over, maintain the speed limit (or whatever is safe at the time). If the moron rear-ends you, it is HIS FAULT in every jurisdiction I am familiar with. Let him; allow his insurance company to pay you for renewed body work and paint.
However, going slower than the flow of traffic is contraindicated, and as I said it'll get you a ticket here in California. If you park in the middle of the road and confront the driver behind you, YOU will be arrested for instigating violence, even if he defends himself against your assault with a baseball bat and is arrested himself. Worse, if he hits you from behind as a result, YOU may be at fault ... if not through the court system (depends on exact circumstance), your insurance company certainly won't be happy with you.