I would argue against that. As a whole relative to most other societies, I do feel the US is about as close to a multicultural society as you can get. Sure, prejudice, racism, and inequity due to cultural or ethnic background will exist to some extent in any society, but in terms of general acceptance and treatment towards people of different culture/ethnicity and economic and social opportunities, I can think of few places where minorities have an easier time. Asian Americans in particular have it better than many other demographic groups within the US, and the average and median income/wealth of Asian Americans are the highest out of any group within the US.