Aggressive Pedestrians

What is the deal with aggressive pedestrians? I see them more and more. You know the type, they walk slowly in the middle of the parking lot row, while you drive slowly behind them. Sure, they could walk over a bit on the side, to allow you to pass. But they feel the need to assert their power over you. They think that just, because you have a car, you are despicable and need to be taught some kind of lesson.

That really ticks me off.