I don't usually confront motorists but I have been confronted by them a few times. Once a truck driver told me he knew where it was "safest" for me to ride, (out of his way, lol) because he was "a professional". Another guy told me he knew the laws regarding cyclists better than me because he was "a lawyer". No minds were changed in either confrontation, but both were quite civil, with no yelling or cursing.

The few times that I did want to yell and curse at a motorist I wasn't able to catch up.