can someone explain this joke?

[HollisterFREAK]

ok there is this joke, which i don't understand at all.

What's the difference between a pizza and a Jew? One doesn't yell when it's put in the oven.

I'm not racist or anything, but can someone like explain this joke to me??

 

[DnA]

it's racist and referring to the holocaust and hitler,bad joke whoever told you.