How does Gatsby's party further differentiate East Egg and West Egg

Nick describes East Egg, with its white palaces and sophisticated residents as "glittering," whereas the "less fashionable" West is home to those with new money living in huge, almost garish mansions as well as Nick’s own small eyesore of a house. The two Eggs represent new and old money, juxtaposing those born into families with money and those who have become rich after birth.

One of the main differences between East Egg and West Egg is that the people who live on East Egg come from old money and the people of West Egg are new to wealth. Gatsby's party shows how people from East Egg (like Tom) can be snobby and look down on the garrish nature of people from West Egg.