It's rude to give someone bad service on purpose.
Amy is a waitress at a Waffle House, and a cop came in to eat something.
Amy has to serve the cop.
Amy gets to the cop as fast as she could and makes sure that they get their food quickly.
Amy takes her time getting to the cop and uses an attitude with the cop.
The cop is satisfied and are glad that they aren't being judged for their uniform.
The cop's feelings are hurt, and they feel guilty for no reason.