If I were him I wouldnt bother. If he doesn't respond he's "walking away". If he does respond he's "doubling down". Ridiculous. He'd be stupid to engage this any further.
I don't know who you are responding to but there are some on this board who get very angry when something gets posted contrary to their own world view. So they engage in attacks both the source and the one on this board who posts it. That is called an ad hominem by the way. I see it differently. I never post and then say I believe any or all of the article I post to be fact, true, or something I agree with in part or whole.
I post because I find the topic interesting. It is not necessary for me to give my stamp of approval to any or all of it. They do not want to see certain topics posted so they flame the poster when it happens. Hey, they are the ones who are not at peace, I'm doing just fine but you are right no matter what I say they are going to flame me because someone has disagreed with their beloved snopes. To bad they cannot just agree to disagree.