One of the quotes given specified that a Muslim Arab is not allowed to marry a Muslim non Arab. I have never heard of this - and even Mohammed SAAS in his last sermon mentioned this specifically, that Arabs were not superior to non Arabs and vice versa. I agree with you about "agreeing to disagree" in a polite manner, of course - but what about something being said that you know for sure isn't true, shouldn't you point this out, politely and without insults or tantrums?