It sounds like Morrison's. In our local store my husband and I were so shocked at the rudeness of the cashier as she literally threw the plastic bags we had requested at us that we burst out laughing. This is also the only store where I have been told that the assistants are not allowed to help customers with packing. I have a dodgy arm which is pinned and wired, so if I am on my own I often request a 'packer'. Asda and Waitrose have no issue with this, although I think Asda are brilliant with customer service.
Favourite small treat when feeling blue or conversely a bit flush

I have neuropathy in my fingers so am slow to pack & pay.