Originally Posted by
Smallsteps 
I'd be highly pissed if AH hung up on me. That's such a childish thing to do.
It is. It would tick me off to no end too. Not much we can do about it on our end other then avoid phone conversations that would result in that response. If he goes there while on the phone you could pre-emptively find a reason to get off the phone or just come out and say "I don't want to talk about this on the phone." or something.
It sounds as if he is feeling put on the spot, which causes a rush of anxiety, and he can't cope. He hangs up (which may actually be a better response then verbally going off) but if you call him back you are asking for trouble.
He needs to learn to cope of course but sounds as if he is working on it. It does take time and if you want to maintain the relationship it will be helpful to come up with strategies that work (like email for triggery topics, don't call him back right away, etc.) Ideally he'd be asking for these things himself but maybe he's not there yet.