I don't think it is fair to call somebody a moron for being unfamiliar with a topic that has, in many countries, been "neither seen nor heard" until quite recen

I don't think it is fair to call somebody a moron for being unfamiliar with a topic that has, in many countries, been "neither seen nor heard" until quite recently. He is certainly incorrect, but a moron? No, he needs correcting, not insulting.