Von Trier's comments are despicable, even though he is a great director though, arguably the greatest contemporary director.
But folks living in a country like the US, which has a long history of heinous and monstrous imperial projects, including recent imperial wars, which no one seems even to be embarrassed about, do not exactly have much moral standing criticizing someone making monstrously inappropriate jokes about Nazis.
What a flaming jerk, though. Galliano at least had the excuse of being very, very drunk at the time, to the point of probably not even knowing what he was saying.