Many years ago I worked in a sandwich bar, we would always ask what they wanted ie bread roll (brown or white) french stick or sliced bread and then if they wanted salad and or a dressing.
One chap came in, barked cheese roll at me then answered his phone before I had chance to ask him anything else, I waited for a gap in the conversation then tried to get his attention several times but he just frowned at me and carried on talking. It was lunchtime and there was a huge queue so I grabbed the nearest roll, shoved some cheese in it and put it in the bag, put it in front of him and he handed me money all the time talking on his phone.
Bet he wasn't too impressed with his boring dry cheese roll when he eventually got to eat it!
I just think it's so rude to be on your phone when someone is trying to serve you, they wouldn't want the assistant to be on their phone whilst serving so why do people think its acceptable the other way round.
These days I always say Thank you really loudly if people let a door shut in my face instead of holding it open or "I think the word you are looking for is excuse me" if someone barges past me.
I no longer move over if people are walking together abreast the whole pavement and can see me coming but make no effort to make way, I just keep going and if I hit them tough!
People treat serving staff, shop staff disgustingly, as a waitress I had a chap whistle and click his fingers at me so I completely ignored him, when he finally found the words excuse me and I went over he said "I've been trying to get your attention for ages" his face was a picture when I said "yes I know sir but I'm not a dog, I don't respond to whistles and finger clicks" other customers actually giggled and said good for you!