In chapter 6 of The Great Gatsby, Nick describes Daisy's reaction to the people of West Egg:
But the rest offended her—and inarguably, because it wasn’t a gesture but an emotion. She was appalled by West Egg, this unprecedented “place.” that Broadway had begotten upon a Long Island fishing village—appalled by its raw vigor that chafed under the old euphemisms and by the too obtrusive fate that herded its inhabitants along a short-cut from nothing to nothing. She saw something awful in the very simplicity she failed to understand.
I'm interested in the part in bold, which says that Daisy was "appalled by its raw vigor that chafed under the old euphemisms". What are the "old euphemisms" being referred to? I've wondered about this for years.
A euphemism is where you use one word as a substitute for a more offensive word. But I don't think Fitzgerald is referring to literal euphemism here. I have one theory: perhaps he means that rich people have upper-class families have a way of masking their hedonistic tendencies. The new-money people of West Egg, on the other hand, are more ostentatious about their hedonism. Is this what Fitzgerald is talking about?