"Let me be clear here. There is nothing wrong with blacks celebrating Kwanza."
Well, then. I apologize. I took all your criticism to mean you did think there was something wrong with black people celebrating Kwanzaa.
All holidays are fiction, at least to the extent they celebrate things that didn't happen, or things that are greatly exaggerated, or ideas blown all out of proportion. Kwanzaa seems particularly transparent because it was invented from whole cloth, a completely artificial holiday designed to give African Americans an answer to Christmas, a holiday many people see as too consumerist, too majority-culture, just too much.
Should we criticize Jews for expanding Chanukah to compete with Christmas? Originally, Chanukah was a minor celebration, but many Jews felt left out by all the overbearing Christmas revelry, so they started emphasizing Chanukah and making a bigger deal of it. Is that wrong? Are they trying to make gentiles feel bad?
Christmas started as an attempt by the Catholic Church to convert northern European people by appropriating their winter pagan festivals. I hardly need to point out that Jesus was not born in late December, and Hebrews didn't decorate pine trees.