I just go by my own experience on the road. Seems like the most likely to be a dick is someone in a BWM automobile. Older, maybe bought well used up at some shyster used car lot with 180,000 miles. In other words, thinks they'll have standing now that they drive a "Bimmer"Bimmer == BMW car
Beemer == BMW motorcycle
FWIW - I don't judge people by the vehicles they drive/own. I've driven/owned everything from a smoking rattle trap with bald tires I got from the recycle pile of a tire store and mounted by hand, to my nice BMW X1. Two out of three of my vehicles are not really road worthy either (or barely).