Back when I was young and stupider, i was almost run off the road, I managed to find the car shortly thereafeter at a beach parking lot. the driver had left the keys in the car, so I took them!, then had second thoughts. It turns out there were several guys who were by then on their way back to the car. I had been planning to throw the keys into the sand at the beach, instead, I waited for them to get back to the car, of course they were like WTF! I told them they almost nailed me, they claimed not to have seen me. I gave the keys back. I wonder if they felt lucky to get their keys back?
Its a common response when I have confronted motorists, they say they didn't see me. At 6"5' Im hard to miss, so either they are lying or oblivious drivers.

So to respond to the original question, very rarely do I ever get a chance to confront a motorist, usually I cannot catch them, there are not enough stop signs or lights around here, (but that's OK!) I hardley ever get any hostility, just scary close calls, like passing 1 foot from me at a 25 mph speed difference. When I have had the opportunity to confront them, I just ask if they saw me and that I need more space than 1 foot between them and me.

One woman who nearly took me out drove into a parking lot, parked and continued a conversation on her cell. I rode up to her, she looked at me blankly and continued to talk. I squirted the window with water from my bottle, she continued to talk. Finally she rolled down the window and told me that her uncle just died. I just told her I was sorry but she should shut up and drive or she might kill someone.