(Book 2 Chapters 7-13) Monsieur the Marquis is miffed at Monseigneur. Why?

The main theme of Chapter 7 is the uselessness and absurdity of the pre-Revolutionary French upper class. Although they consider the world to be in order so long as everyone is dressed correctly as for a fancy ball, their position is unsustainable because none of them performs any useful jobs. The military men know nothing about war, the religious men are lascivious, and the doctors cure only imaginary diseases. The Marquis wants nothing to do with this and has no wish to become a part of it, thus, he condemns his uncle and gives up his inheritance.