Well even if he blockades the parking lot with his truck, that just leaves you at sort of a standoff... He'd have to get OUT of the truck to do anything to you at that point, which would seriously even the odds. While I totally agree that it was creepy, it also seems kinda absurd that some trucker would get it in his head to flatten a bicyclist (even if he thought you were rude) and go out of his way to do it. Those trucks aren't cheap to move around, and an accident on a professional driver's record is a WAAAAAAY bigger deal than for a regular person like you or me.

Of course that is all light-of-day sensible logic. If it were ME being followed around at 0345 by an 18-wheeler, all I would be able to think of is that incredibly stupid corny movie where the trucks were taken over by aliens and chased people around trying to kill them. And it wouldn't seem quite so corny...