A shop in Germany put up a sign saying Jewish people aren't allowed inside, which made lots of people angry.
The shop owner said he was upset about what was happening in a place called Gaza, but that's not a good reason to be mean.
Important people in Germany said that this is very wrong and that it's like something bad from a long time ago.
It's important to remember that everyone should be treated kindly, no matter where they are from or what they believe.
