The Intellectual Inconsistency of Championing Diversity While Condemning "Cultural Appropriation"

I had a moment of clarity last weekend and realized something. The very same folks that love and laud the benefits of "diversity" (while never really explaining or proving what those benefits are) are the same ones who will hector you to death for engaging in what they call "cultural appropriation." How can this not be seen as the most fundamental contradiction and blatant intellectual inconsistency?