The joke is not about Hitler, his regime or his goons ... it is about some obscure snowboard and hitler and his goons are just used as backdrop. Now, how would you feel if somebody came along and used the attacks on Pearl Harbor or the WTC as backdrop for jokes.
By using it for a joke or considering it funny, one is trivializing the original event. If you want to make fun about Hitler you have to measure up to Charlie Chaplin, and that is satire and a completely different league.