Okay kiddo, so do you know what being Jewish means? It means that someone believes in a religion called Judaism and is part of a group of people called Jews. Some people in the world don't like Jewish people, and that's called antisemitism.
Now, let's talk about Japan. So in Japan, there are not many Jewish people, and a lot of Japanese people don't know much about them. Sometimes, when people don't know much about something, they might get confused or say things that are not nice. Some Japanese people might not even know that what they are saying is hurtful to Jewish people.
But, it's important to remember that just because someone doesn't know much about a group of people, it doesn't mean it's okay to say mean things about them. That's not fair or kind.
Thankfully, there are organizations in Japan that work to educate people about different religions and cultures, including Judaism. They teach people how to be respectful and accepting of others, no matter where they come from or what they believe in.
Remember, it's always important to be kind and respectful to others, even if they are different from us. We should treat others the way we would like to be treated.