I find the assigning of genders interesting. Perhaps in some cases he can see who is actually driving and knows for certain, but it seems like "slow/lost/minivan driver" = woman and "aggressive/truck" = man. I wonder how accurate that is.
Whenever my Dad gets annoyed by a slow or hesitant driver he says "you go, girl!" and it drives me nuts. Roughly half the time it's a man behind the wheel.