I've yelled at one guy for nearly running me over when I was clearly signaling a turn and he tried to hurry around me, then he slammed on the brakes and I almost ran into his passenger side door. I got off the bike and looked it over, then shouted every profanity that I could think of, he sort of squinted apologetically and sped off. The guy in the F150 behind me was laughing his butt off.

Otherwise no need to yell, the rednecks would probably shoot me if I did it too often