Sentence:  “I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the <WSD>insolent</WSD> chatterers at the opera, the gorged dowagers,...the chlorotic squatters on huge yachts, the speed-mad fugitives from the furies of ennui, the neurotic victims of mental cirrhosus,nb...!” 
Meaning of the word marked with <WSD> tags:  rude