I'm going to refuse to pull through a parking spot into the one in front so another customer could park behind me
Why would you not pull through?
It's just a mean but decisive thing to do
Just pull through to the next space. You would be helping someone out and there is no reason not to.
Okay I will try to remember that the next time I'm in the store.
It is good that you changed your mind about this. It is good to not inconvenience others for no reason in situations like this.