I like Bilbo have no loyalty to any retailer.
I took my bass into where I bought about a month ago because the clip on the battery compartment had broken - not my fault. Anyway took them ages to get a new part. When I took it in I got the usual, "oh the bloke dealing with that is off today". The owner turned to his minion and said well you can sort that one, to which he said "well if I've got time". It was a Tuesday morning, and I know they never ever get anyone in there on a Tuesday morning. I had other business in town and said it was fine I can come back at the end of the day despite the fact I was told it would be repaired while I waited.
Basically their attitude was awful, the guy I was dealing with at the beginning was very good, but these two just sucked.
The upshot is I won't be going back to purchase any major bits of equipment unless it's dirt cheap. Which it won't be.
With regards to kids being more disrespectful, from a personal point I think it's across the board. The rudest and most thoughtless people I encounter day to day are elderly, but on the flip side there are people of the same age who are the funniest, wittiest, kindest and warm hearted people I've met. It's just people.
One older customer of mine really gets up my nose, rude, arrogant and generally objectionable.