
awww, dammit
Fine. Maybe he had a best friend in his youth who hit on him, and he's never recovered.
Really, there is NO WAY to guess his motivations, since he claims to be non-religious and hasn't given anything obvious to latch onto. Early programming is enough for most guys to end up like him, though, and the slate article was a pretty good description of the all-or-nothing "you are gay" fear that many guys have.
He's old, and he grew up in a highly repressed social environment though, so he fits the general viewpoint of his generation. We did too, but we had enough exposure to get past it. In my case I hung out at the RHPS for over 50 showings, and the crowd were my buddies. That was 9th grade. Totally fixed me.