I will fess up to being pretty disrespectful to bad drivers. I give smarmy smiles, thumbs up, thumbs down, occasional spankings when their rear sits in the bike lane, and have even spit on a car that nearly laid me out...
My crowning acheivment in the field of bicycle buffoonery is the reversal of littering. I LOVE seeing a motorist ditch something out an open window at a red light, cause I will take the time to pick up said litter, return it to the inside of the vehicle with a "you dropped this!" Then I turn around with the red light halting them and freeing the opposite direction for me to sprint away like some sort of aggressive yet cowardly vigilante. Then let my heart rate settle and reroute back to (where-was-i-going-again?).
Rarely do I actually exchange words, and I'm never approached by the drivers I actively disrespect.
All that nonsense said, most bad drivers are unsure of when or how to turn or double park here, so they just get passed with a shake of my head.