I was at the supermarket self checkout this morning when it all kicked off. The staff member reminded a customer to scan his carrier bag. He told her not to be so rude, and she started ranting about being abused over a carrier bag. Then told the manager who came to see what the fuss was all about that she'd only asked him to scan the bag, and she wasn't taking that kind of abuse.
She was rude though. Not in what she said, which was reasonable enough, but in her tone, which was far more accusatory than helpful.
She'd done it to me just previously when I was having trouble getting something to scan. She came over and sorted my problem, told me what I was doing wrong, but her tone was very much fgs how can anyone be so stupid. Again, if she told that story back, she'd been perfectly helpful.
Obviously in the sceme of things neither event is the height of rudeness, but she was rude.