Race is not only an artificial concept, but it is also inseparable from a legacy of slavery and subjugation. Loving one's culture is a wonderful thing, and being fascinated by the cultures of others is very healthy. It starts to become detrimental when people demand that cultures remain homogeneous and unchanging, as if that were a desirable state, when most of history's great cultural, artistic, and philosophical flowerings were the result of exchange between cultures.
Think of it like a chemical reaction. Who would think that a silvery metal that explodes on contact with water combined with a poisonous green gas would produce a delicious food additive? Who would think that a city-dwelling culture whose religion is based on peaceful asceticism could combine with the culture of warlike pastoralists who worship gods of fire, sex, and drugs to produce one of the richest philosophical traditions in history?