Anti-Semitism is nothing but the antagonistic attitude produced in the non-Jew by the Jewish group. This is a normal social reaction. The Jewish group has thrived on oppression and on the antagonism it has forever met in the world... the root cause is their use of enemies they create in order to keep solidarity.
If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.