I have only confronted one person. It was at night on a not very busy 4 lane street. I took the lane as I normally do down this street at night. A blue volvo wagon came around me very close and then started changing back over into my lane when my front wheel was at his rear passenger side door. I hit the brakes and pulled over though I didnt have much room between me and the parked cars.
When I recovered I pedaled the 100m up to his window and asked him if he knew that he almost ran me into parked cars. He replied, "Yeah, you need to get where you belong!" I asked him where that was, and he said "the sidewalk". I told him it was illegal to ride on the sidewalk as was it to run other vehicles off the road. He told me I was wrong and I offered to get a police officer to clarify those issues, but the mere mention had him gunning it. I think it was because he was talking on his cell phone without a bluetooth.
I only confront if they have put me in danger...I understand that they are angry and separated from the world.