But the rest offended her-- and inarguably, because it wasn't a gesture but an emotion.
Daisy, as a member of the aristocracy, is very used to living with “gestures”, as throughout the book Nick heavily emphasizes how the upper class hides under a facade of propriety. These manners are fake and lack warmth, such as the times when we see Jordan Baker carefully balancing a non-existent object on her chin more than once. Other artificial gestures in Daisy’s life include maintaining her marriage with time by pretending they both love each other — because that is the socially acceptable behavior — and the way she treats her daughter as an object to be marveled at rather than a human being, like on the TV show Toddlers and Tiaras
On the other hand, there are the “emotions” that Daisy deplores. Emotions are raw, irrational, and real, and they are representative of the struggle for self-improvement associated with new wealth and the American Dream. She is “offended” because she is accustomed to her one-dimensional, casual life of the upper class, and the stark contrast between that and the vitality of the party scene disgusts her, so she looks down on the crowd full of emotion in comtempt
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