Now why would you pull into a parking spot I am standing in when there are plenty around?

Earlier I had gone out to pick up a few ingredients for dinner. I had about two bags worth of items and was unlocking my car to put my bags inside. This car pulls up and starts pulling into the spot I am partially standing in getting a bit close to my backside for my liking. Mind you I have my door open and am trying to place my bags inside. I end up dropping a bag popping open my little container of chopped celery sending it everywhere inside the grocery bag trying to hurry up so I don't get ran over. I hurry up and finish and get inside my car and it's these two old biddies staring at me slackjawed with eyes glazed over. I'm looking at them with disbelief and they are looking at me without a single thought in their head. Goodness gracious if they would have given me a moment I would have been in my car allowing them to pull in. If I see a spot someone is occupying partially say loading groceries I either wait if the spot is good or park elsewhere. I never whip into a spot like that. I just couldn't believe the impatience.