You probably saw some images like this already 
In some 9gag posts there are actually some people making fun of them.
Now, for those who answered yes or a little, if you knew one of the workers was rich and was just working there for fun or experience would you still look down at them? (this happened in one episode of K-ON, where the rich girl decided to serve at a restaurant).
Also in Japan it is expected for youngsters work this type of jobs.