He dropped into a FB group I frequent once. Had a few back and forth then deleted all his posts and complained how he was interested in an honest discussion but we were mean to him first.
Alas, familiar with his MO, I keep screenshots whenever I spoke with him, and also never replied to him directly but always tagged him in comments, as that way he can't delete the conversation.
Got a folder with screenshots of his comments, mainly in regards to when he claims NASA will reveal the 'truth' (after Artemis 3), I'm interested in what his excuse will be after A3 comes and goes with no 'revelation' from NASA.