OMG I'm laughing so hard that I'm crying. I'm literally in tears laughing at how ridiculous this guy sounds.
You should record it and send it to the city news station... they love exposing local crazy stuff like this. As long as that is legal to record a conversation without telling someone in your state.
It is one thing to delay for true concerns, but his threats sound like they have less to do with your project than they do with the issues between your guy and the inspector.
I will say that our GC spent a fair amount of time at the permit office, and luckily, the head guy was a buddy of his so he didn't bend the rules, but he helped figure out the ins and outs so that the inspector couldn't pull any more power plays after we had one fail for a conjured up reason that made no sense to anyone, and we didn't have any crazy issues after that.
SHIT. He just said if the owner questions him, he's sending the entire plans back to structural engineering and will add another 14 days to this. SHIT SHIT SHIT. The contractor here insists the owner will stay out of it and won't question him.
Wait you mean YOU as the "owner?" This is not a professional interaction and I would totally intervene.