Koodoo's for getting someone out of the car to help search out a spot. I would have an issue if I'm waiting for someone to get out of a spot after being there as they entered the car then a pedestrian tried to lay claim on the spot but if someone is standing there as I came up to it, I'd drive on.
I had one delicate moment once when I was backing into a spot, a smart ass in a sports car cut me off and drove into the spot. I was at his door as he opened it and after a he realised the bigger picture of events that had occurred, he backed up and let me park.