Where does a black jew belong? The back of the oven
Are you making fun of the holocaust?
I joke about the oven to say, "what's the difference? black people are all thugs." It's funny.
The holocaust was a traumatizing event for many people and it can be hurtful to be reminded of it even by mentioning or joking about them being incinerated. You should go to a holocaust museum to understand what happened there and why it can be hurtful.