The ban on the Koran and other nonsensical rantings

[Samia]

Leave him be... when you meet with him say "PEACE"...

Why?
Because the Quran said so..

And the servants of the loving God are those who walk upon the earth in humbleness,
and when the ignorant (Al-Jahilunna) address them, they say Peace

With due respect, I do not agree that this verse is applicable in this situation. He is not addressing Yasin. If he was, it would be a private/personal matter and Yasin may just ignore the insult and say "Peace". But this is slander. With slander you are not commanded to say "peace", on the contrary, this is a venue of lawful struggle (and debate them with the qur'aan).