The world we live in:
A place where it's completely okay to ban a long-celebrated traditional holiday because there are people depicted that could be construed as racist, but during a different holiday it's okay if someone dresses up and acts like a stereotypical depiction of a race (i.e. someone dressing up and acting like Crazy Horse) just because it's a holiday where you dress in costume and pretend you're someone you're not.
(and believe me, if you do that and say you're not trying to be racist, then it'll be a socially acceptable thing unless someone in your vicinity is offended by it...not that it's any less offensive)