What are Higgins' and Pickering's criticisms of fashionable society? Act 4

Higgins complains they're foolish;

"The dinner was worse: sitting gorging there for over an hour, with nobody but a damned fool of a fashionable woman to talk to! I tell you, Pickering, never again for me. No more artificial duchesses. The whole thing has been simple purgatory."

"... the silly people dont know their own silly business."

Pickeringfeels the same way;

You see, lots of the real people cant do it at all: theyre such fools that they think style comes by nature to people in their position; and so they never learn.