A fake holiday that blatantly rips off Christmas and Hanukkah. I have nothing against celebrating black culture, but isn't that why we have Black History month in February?
Nobody is asking you to celebrate Kwanzaa. If you showed up at someone's kwanzaa celebration in Oakland or Cabrini Green, I think they would ask you to leave. Kwanzaa is a black holiday for black people. The idea is not that black people want you to celebrate their culture, they reject your culture and want to create their own.
The way mormonism is bottom-up folk-theology, attempting to create a sense of identity for a group of people in America, Kwanzaa is folk-ethnic nationalism.