Why did Daisy and Tom find Gatsby party loathsome?

There is a underlying ever present tension between the inhabitants of East and West Egg due to the 'new money' that live in West Egg and the 'old money' who live in East Egg. Daisy and Tom live in East Egg and find the West's parties garish and not as elegant as those thrown where they live. The drunken attendees are not the sort of people who Daisy and Tom usually socialise with.