I know some of them need a lesson in customer service but others have my admiration for putting up with silly customers.
In supermarket earlier, checkout lady scanned a reduced item which came up as £541 (very expensive loaf, lol!). When she tried to void it, it then doubled the amount. After a minute, she managed to void both items but then needed someone more senior to reset the till so that I could pay. Enter couple behind me. There is a time when people should keep their mouths shut and this was it. Checkout lady was already stressed but no, man had to then make stupid comment about walking out and leaving their shopping. Woman then interrupted supervisor dealing with another customer to complain about time it was taking to resolve issue. I made point very loudly to supervisor that I hadn't complained.
I know that shop assistants are supposed to not react, but between us the complaining customers certainly knew they weren't being clever. Rant over.......