Demeaning to you is different than to the GP. Make a list of jobs you could perform with no significant education, experience or skills. Most of them would meet your definition of demeaning. The GP argues that any honest work carries a certain level of respect in his eyes.
And really, you think fast food is the bottom? Have you ever seen Dirty Jobs? Maybe spend some time with migrant laborers? How about hotel maid? Prostitute? I could go on.
My daughter is looking forward to turning 16 so she can get a job in fast food - she sees it as an opportunity to make money, and believes that relative to other fast food workers she will excel and be promoted. In fact, McDonalds is rightfully proud of the number of franchise owners that started out as line workers. Any job that has a boss has an opportunity for promotion.
Just because you see the world from an elite tower of opportunity doesn't mean everyone else does. Come on down, and see life from the ground up - it really makes you appreciate what you have.