(This happens to a coworker after having an issue with an order.)

Customer: “That took long enough. This is why you should have gone to college!”

Coworker: “I’m only 16.”

Customer: “Well, you shouldn’t have dropped out, then!”

Coworker: “I didn’t. I’m still in school.”

Customer: “I… uh… have a nice day.” *leaves embarrassed*

Related:
Gettin’ Schooled, Kindergarten Style
Pantzilla Gets Schooled