I don't think it's cars, per se, but the drivers behind them. As a class, I'm not fond of 18 wheelers just because of the push and pull wind effects they generate as they pass me by. As another class, any siren blaring vehicle passing by, driving an icepick of pure sonic fury into whichever poor earhole is facing them, is a high annoyance factor.
For all the rest, it's the drivers rather than the vehicles they drive, that drive me bats, like the youngsters in the diesel pickup trucks that love to gun their engines just to blast the dense cloud of emissions right into my face, or the young idiots who love making their modded cars or motorcycles rev as loud as they can while next to me at a stop light.