What do you call a train with 3000 Jews on board? Anything you want they ain't coming back
Do you think it's funny to make fun of Jewish folks?
I know anti-semitism is a serious issue and I'll be careful about that, but Jews have done things that I found irritating and annoying. It's true what you are saying, but it's just a joke folks don't make a big deal about it.
Even though it's just a joke, it reinforces the stereotype that Jewish people are inferior and it speaks cavalierly about them being put to death. Consider how you would feel if people labeled you deserving of death due to your race or ethnic background and try to be more compassionate toward Jewish folks in the future.