Following the sage advice of not wrestling pigs in mud...I no longer respond to him.

He ignores the point, pretends to have missed the point (giving him undue credit), or responds to a tangential point of his choosing so often that it's a waste of time. (Also offers him his desired opportunity to "repeat the lie".)

He's a hard, hard left propagandist. The depths of just how far left he will go haven't been plumbed yet...because no evidence of any bottom has been found...