When were black Jews most prominent? Around 1941-1945. Specifically after leaving the oven.
What are you trying to say with this offensive joke about the Holocaust?
Just like the Holocaust, you will all pay for what you have done to us and we will win eventually.
It sounds like you are threatening violence against people which is not something to do. The Holocaust was a serious issue and joking about it trivializes what the victims and their families went through. I think you should visit a museum with a Holocaust exhibit so you can better sympathize with what happened then.