I do have to wonder how much of what he perceived as anti-semitism in childhood was instead kids being their usual nasty selves and picking on anyone who was the slightest bit different.
No doubt plenty of that, especially if he didn't fit in perfectly. Jr High is about the crappiest time in a person's life if they are not good looking and popular.
But, when someone calls you a Jew-boy or kike and then punches you, well that's pretty clear.
Either way, it appears he had a rather combative youth.