It is objectively true that Norway, compared to the US, is a racial monoculture. Sociological evidence suggests ethnic diversity correlates negatively with social cohesion, though recent studies also suggests that while causal, the effect depends significantly on their prior preferences.

That's not saying "people can not trust others of a different skin color", but it is saying that generally speaking, people in more ethnically diverse communities are less trusting of each other. Call that what you will :)