It's called 'customer service', not 'taking people's s***'.
For real.
I got hired during Christmas at Meijer. It's like a super wal-mart and incredibly busy. There was more than one day that I had to go on break and just cry because several customers would chew me out for things I had no control over.
One man older man who was nicely dressed like a doctor or lawyer: his wife was paying me. I had bagged all of their groceries and had to put some up on the carousel because he wasn't putting them in the cart as the carousel would fill up. Anyway, he said to me in a very mean, sarcastic, better-than-you tone, "Well, I guess you're going to have to me on your pay roll. You'd think I'd get some help loading these groceries on my cart." I ignored him and finished the transaction. His wife looked very embarrassed. The man was very healthy and sturdy looking. He was no helpless, frail little old man.
The old crank didn't know that from the beginning of his order, to the end of the transaction, I was being timed and counted item per minute against the time it took for the order plus transaction. My results were posted along with the results of all cashiers, each week. If I got below 95%, I was taken into the office and given a written notice that I had to sign. If I received three in a three month period, I would get the ax.
There was nothing wrong with this man that he couldn't put his own groceries in his cart, or at least wait until the order and transaction were finished and I could have stepped around and placed the bags in his cart. He was too good to do such a menial task.