Toyota Prius drivers

I’ve noticed a pattern recently; all Toyota Prius drivers are dangerous on the road.
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It makes me wonder, are they playing with the fancy onboard computer, checking if they’re using the electric or petrol motor. Another possibility is that they’re driving in a way which conserves fuel. This certainly seems possible, since I seem to find them driving slowly in front of me and braking. This is even worse when they’re in the commuter lane thinking they’re saving the world.
Add to the “on the road”, “in the parking lot”. It turns out that they can’t park either. Nearly every morning when I get into work there’s a Prius parked diagonally in a space.