Well....since this thread is titled "gas station pet peeves" and is not specific to gasoline.....

You know what really grinds my gears.....those giant 1 foot tall concrete barriers right next to the pumps. They are just short enough that you don't see them when you open the door......yet still tall enough to catch your door with their corner! I'm not talking about the concrete filled steel tubes......but the concrete barrier that's shaped like the letter "D"!