Save A Lot complaint: Worst cashier ever

My mother had knee surgery and is currently using a walker, but utilizes the in store wheelchair for pain relief. As she was checking out, I started grabbing the bags to carry them out. The cashier, I believe her name is Stacy, according to the receipt, she yelled at me that I can’t take the bags until they are paid for. That’s perfectly reasonable. The attitude and horrible attitude she had during the interaction was completely unwarranted. So I stood by the door, waiting for her permission to take the groceries, and I ASKED if it was ok, and words cannot describe the way this woman acted. She flailed her arms around as I walked away, but I couldn’t hear her, only thing I heard was that I don’t need to come back. A store I go to at least once a week or more, that’s in a small town I grew up in, and some cashier speaks to me like this in front of my mother. Was I going to steal food and leave my mother on a walker to deal with the consequences? Sadly, I’ll have to travel to a different Save A Lot in the city since this woman wants to be rude to me. The young lady that was so helpful and apologetic, said she’s always mean, and that’s coming from a coworker.