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

Higgins finds high society members foolish and silly.

HIGGINS [yawning again] Oh Lord! What an evening! What a crew! What a silly tomfoollery!

Pickering finds the ocassional foray into high-society exciting because it makes him feel young again. He also comments on how many members of society cannot pull off "style" because they've never taken the time to learn.... they foolishly believe it comes naturally just the their inheritances.

PICKERING. You've never been broken in properly to the social routine. [Strolling over to the piano] I rather enjoy dipping into it occasionally myself: it makes me feel young again. Anyhow, it was a great success: an immense success. I was quite frightened once or twice because Eliza was doing it so well. You see, lots of the real people can't do it at all: they're such fools that they think style comes by nature to people in their position; and so they never learn. There's always something professional about doing a thing superlatively well.