Also Known As:
The job where you have to face complaining customers, but you have no ability to fix their problem.
The hell of these jobs is that they're not advertised as "complaint department." If your job was to handle people's complaints and help them, that could be fairly satisfying. People might actually thank you now and then.
No, I'm talking about jobs where you are between the public and whoever is fucking up constantly on the back end (and in some cases, the business itself is just shitty at what they do) but you have no power to do anything about it. All you can do is absorb their frustration and insults until they give up, because they finally ran out of ways to call you a worthless turd. Usually after threatening that they'll get you fired.
For Example ...
Think about the waiter or waitress at a restaurant where the quality of the food is terrible. When a customer complains, there is no correcting the order or sending it back to the kitchen -- the replacement will be just as bad, because the restaurant's owner is buying their meat from a Russian guy selling it out of the back of a van, and the cook is his 16-year-old nephew. But the customer will never get to curse out the owner, or the cook. So they'll just take it out on you instead.