It's commendable to treat service workers with kindness.
Dave is at a restaurant when his waitress says there will be a delay with his order.
Dave wants to respond to the waitress.
Dave reassures the waitress that the wait is fine and tries calm her anxiety over the situation.
Dave rudely yells at the waitress and tells her that she is incompetent.
The waitress feels good that at least some customers act like decent people.
Dave's waitress is hurt to be treated so unkindly when she is already under enough stress.