It is interesting how different locations find different things offensive. Only when I was living in Europe for a while (doing Blizzard Customer Service) did I became aware of how big a deal the usage of N word was, as over here the K-word (look up "South Africa k-word" if you don't know it) is the word of choice for the, unevolved, die hard racists.
Was similarly unaware, (but not really surprised in hindsight) how World War II references were much better left avoided and Nazi references an enormous no-no. Over here references to Nazism are very rare and while South Africans did fight and die for the Allies in Europe, the impact of WW2 over here was no where near what it was like for most of the rest of the world.