In short, he does not know what he does not know.
Before I had a handle on Bob and his ways, I responded to his repeated invitations and sent an email suggesting he understand the difference, which he manifestly did not, between deductive logic and inductive logic. I reprint below his reply, from March 28, 2002:
What more can Irl or I add, pedantically, or otherwise?
When I observe an effect and determine the cause by eliminating theories A and B being left with C, which is more plausible than the rest, that is deductive reasoning.
Do you really have to get this microscopic to try and refute me? Man, that boosts my confidence that much more. Thanks. Bob