The man believes dinosaurs and man and apparently giants all coexisted together a short time ago. That would make him a stupid person and you as well for sharing his belief. Genuinely stupid.
The other possible explanation (and I believe this to be the case) is that he's a deliberate liar. I think you're exactly that as well, except that you do it as a funny internet Poe persona.
ctc is either incredibly stupid, like trauma to the brain stupid or, he's just a well executed internet Poe.