No statistical data to back this up, but when I see a driver making an egregiously bad move in traffic whether I'm driving a car or a bike, there is a highly disproportionate share of Dodge products - Rams, Chargers, Challengers, even some of the smaller cars. Doesn't extend to Chrysler-branded vehicles for some reason. BMW drivers often drive like the world owes them something as well, on the highway, but I rarely encounter them on the bike. Dually pickups are pretty bad too, especially the mini semi rig styled ones - the people driving those seem to have real psychological problems. Otherwise it's a mix.