Got to say I have no problems with landing for a spot of refreshment, but..
If I had my pile of shiny metal parked in the CAR park, and some dimwit's downwash pebble dashed it for me, I'd be less than happy. As someone said earlier, wasn't there a field or something nearby??
Whether the guy was doing anything dangerous is up for debate I suppose, (I'm being deliberately liberal here) however it was in the least, a bit inconsiderate.
Without wishing to whip up an argument, with regard to the input from the Southern hemisphere, are we really comparing apples with apples here?