I've had. (not in fast food) I was never rude to any new customers. Why take it out on people that are innocent of that? that makes no sense lol
If anything I was extra nice to the nice people, not the opposite
I've seen what some put up with, from their bosses, co-workers and customers. I was lucky I didn't stay in it long.
And anyone saying that working fast food or in a restaurant is a menial job has never done it.