The lack of granularity in America is honestly extremely annoying to me, different states or cities generally have wildly different "white" culture, traditions, commonality, and attitudes. It is often more hidden or subtle and less overt or surface level like it is in Europe.
Equally annoying is when people attempt to define 'African-American' as though it was one homogeneous entity of experience. The experiences and struggles of a young black man in NYC is vastly different from the struggles of a young black man in rural Alabama.