What distinguishes Nazis from Jews? The gas chamber wall..
Joking about the holocaust is something you enjoy?
They were making fun of the holocaust, and statement like this statistically occurs in 3 times the frequency after they had been exposed to hateful material.
The Holocaust is not something to be making fun of. You can't twist something so horrible into a joke. I am sure if you were jewish or had jewish ancestors, you would not find in humorous.