I mean service jobs are never great, but most of my jobs from 14 through early adulthood were all service and they weren’t that bad.
You encounter plenty of rude and unpleasant people, but you just get on with it. It’s not traumatic for the vast majority of people. Learning to handle people like that is a good skill to have.
I totally agree that people would be better to each other if everyone had so service job experience.