what I hate is when you are riding down the street, on the opposite side of where people drive (right in the USA, left in Australia etc.) and some car behind you starts beeping its horn and zooming past you all pissed off, sometimes the finger. When I'm in the middle of the road without noticing it and this happens, I respect peopl'se reaction. I also hate it when people in the middle of the street are offended that a car honks at them.
Lastly, I hate it when your doing like a chair man, fakie, fsf, and are going for a huge distance, and beside the curb , and the car going down the street is going 1 mph because they act like your that close to them, and they take so long, you are about to run in to parked cars, so you have to stop.