For the same reason that white kids are "Too young to learn about racism" but Black kids their same age are old enough to die from it. Emmett Till was even younger than Anne Frank. 🤷🏿♂️
If we look for rational logic or consistent points in these arguments from racists and antisemites, we will not find it. They know that this doesn't make sense. They don't care.
We don't have to try to find logic in their arguments. There is no logic in trying to teach their children this type of hate.