I always park as far away from the doors of a supermarket as I possibly can. No good just picking an empty area somwhere, as Dorris WILL park right next to it. I think they do it because theyre f**king blind and cant see the white lines - so they use your car to line up against.
If I have to park between two cars I look for posh or new cars, and park closer to the posh car than the banger if two posh cars arent available. If theres only spaces with bangers either side, I drive to the next supermarket and repeat.