Disposed (seeing 1)

The working class to Deresiexicz is  a someone who receives an hourly wage. He then continues to say that this definition doesn't include professionals, managers etc. I think he makes it clear that he doesn't like the fact that people think of working class as people who work labor intensive jobs. Why do they have to be the only ones considered for working class? Why do they seem lower than the middle class? What is the middle class? It seems funny that even the working class could make more money than the middle class but they're still considered lower down.