> ..people are still referred to as “Black Americans” and “Asian Americans” instead of just “Americans” (similar in other countries) although they have lived there for generations, while there simply aren’t many non-Asian looking foreigners living in Japan for a long time.

Why is this listed as a fault (or even listed under “most Western countries”)?

This is proud component of American culture. You’re more often to find people embrace this than see it is a con.