I referencing when the Allies are coming up with random theories, and France mentions that Germany is sending millions of Jews to death camps.
They all laugh and say it could never happen. Which is facepalm worthy. (first work camp was built when Hitler got into power, although they didn't start with the extermination camps until 1941, which was after France was taken over. Also, the allies were given plenty of intelligence on the death camps, although the dub does get one thing right- They didn't believe it, or said they didn't.)
Although that example works, too, though.
Also, Saki, if anyone else in the series said something about it I'd be pretty pissed, too. Germany isn't the only country to have committed genocide.
As for "don't like don't watch. ." Well, you don't have to watch it, but the fact that it tactlessly makes fun of genocide and horrors is rather. . Well, I tend to not have much respect for people who make those sorts of jokes and would actually like to break their kneecaps, how about that?
As for Israel, I see him wearing an IDF uniform and carrying around an Uzi. Not all Jews are Ashkenazim, after all.