i think it's all of the above.
just day before yesterday, on commute home, i saw a dip-sh1t in golf wagon that i just passed on the left move into left lane, even though there were no other cars in front of him in the second lane. obviously i was in front, but i was still making distance from him.
there were cars moving faster than it lined up behind me in the left lane, that's why i moved. and this a-hole moves into left and block a string of cars obviously moving faster than him, amongst which was a ford GT with a subtle aftermarket exchaust.
.

i wanted to be passed by that car.
this was on deerfoot tr south bound, a real deal 4 lane highway.