IoneNe that was an awful post.
I really like the ladies in the supermarket (not that I go often, have most of it delivered) and always have a nice chat with them. If I'm being served by someone who looks under 21 I always ask if they are going out tonight, are they at school, on a gap year, etc.. Usually they are and often we have a chat about their mum being at home cooking them dinner before they go out.
Also, I often need help when I'm clothes shopping. I often chose two/three things and it's wonderfully helpful when the assistant is on hand to get a different size for me or make another suggestion, or offers to get a pair of shoes so I can see what it would look like with the right shoes.
Very occasionally someone in a shop is rude or unhelpful but not very often. I have a very bad back and usually staff are really happy to help me get something from the bottom shelf if I can't reach it.
One little irk I have is the gum chewing. I really don't want to see that but it doesn't mean I'm rude.
If one of my children had said something like you can't have done well at school because you work in a shop, they would have been in deep deep trouble. Which reminds me, my son was difficult in the John Lewis shoe department once when he was four. I have him three warnings to be well behaved and polite, apologised to the lady and we left. The next day we went back with a card from him to say he was very sorry to have been rude. The staff were very surprised and said their lives would be greatly better if all children were shown how to behave.
Having said that I do sometimes find staff are rude and I will stand and wait for a thank you or say "I'm sorry, did you mean to say thank you"?
On the whole the place where I find people rudest is sadly in hospitals. I'm afraid that's where I see people being messed about, hear raised voices at the patients and patients being spoken to as though they are thick. I find it rather sad.