disrespect to fast food employees

Im a manager in fast food and you have no idea what I have seen people do and say to my employes and me. They will throw change or food at you curse you out yell at you. Honestly it makes me upset that some people think they are so much better than us that they can treat us like shit. Like for example tonight this guy came through drive tru 10 minutes before we closed he wanted chicken and my employee told him it would be a 5 minute wait. So while she was waiting there was some tea on the counter she was cleaning with a wet rag. So the guy get all mad saying how its disgusting and how he's going to throw the food away and write a bad review.