In my personal experience, I do find that larger vehicles (excluding transport trucks) tend to have an "own the road" attitude. I think that's why certain individuals aspire to such a vehicle, especially for a single driver, as opposed to a luxurious sedan/coupe/convertible. I'm not saying ALL, just more than other types of vehicles. Again, in my own experience, I find the worst are mid-day drivers in luxurious pickup trucks or large SUV's. These are often company vehicles and the drivers have some place to be and, feeling that their time is more valuable than everyone else in traffic, decide that using their size/weight can be an advantage when flying up an onramp and shoving back into traffic at every opportunity.
I realize I'm on a rant now, but the worst is heading North at 4-6pm at the 401 East/West split. The merge lanes slow down, but instead of queuing and waiting, car after car hammers up the exit ramps and then barges into the desired lane at the last minute, slowing everyone who actually waited.