That is the resort of the far left of the bell curve. They don't understand why they don't understand, so they resort to name calling and eventually threats of violence.
No amount of explanation will get through to him. He thinks if he keeps repeating something, it will become true. He thinks truth is something he creates when he speaks, not something that can be discovered or learned...which means he can be forever blissfully free of the burden of awareness. Given that, your true audience is not him.