well.... I think we have to realize that some of our minorities are much more sensitive than the rest of us and must be protected from any teasing. No punishment is to great to offset the anguish they may feel over a person in blackface say..
equality can only come when we realize that blacks need to be treated differently than everyone else. It is still ok to go as a viking and maybe spiderman tho.... not sure about indian chief or (for the women) french maid.
it can be a little confusing but fortunately there is a veritable army of the PC around to help us by being outraged.
lazs