@ossobuco,
I second your concise answer Ossobuco.
Blacks and white marry each other. Sometimes the marriage works well. Other times, the marriage is on the rocks. Blacks and whites also work together. Sometimes this relationship is solid and strong. Other times, not so strong.
The same can be said about any combination of races. Whites marry white people. Sometimes the marriage works well. Other times, the marriage is on the rocks. Etc....
Persons of Asian persuasion work with Hispanics. Etc....
Racism, cynicism, and opportunism still exist at a group and individual levels. That said, because these negative forces still exist doesn't make the existence of genuine honesty impossible for individual relationships.