Agreed. Personally I ignored his/her post after approx the 3rd line & explained why in detail more than once as you have.<quoted text>
I've explained this to him before. Unfortunately, he doesn't post to contribute to a discussion. He posts to annoy people. My suggestion is to completely ignore him. The more attention you give him, the more he will post meaningless nonsense. He is nothing more than a boring troll.
I will quit doing so. It has become somewhat like howling at the moon....Useless.