Just want to check where you get the 4hr reply from?
You emailed him at 7am. Your thread started at 11. What time does your office open, would this guy be working at 7am?
If not then surely you'd not expect him to reply in anything under 2 hours.
You could have called him, even if DS was screaming in the background, tbh that'd be fine as it illustrates your point perfectly.
I think he has got off on the wrong foot with you and your hackles are well and truly up.
You may never like him, but you need to get on.
Hope you don't misunderstand my post, I am 100% sympathetic to you, I have worked with some total arses and it is hell.
Call him this after noon and ask him how he's getting on and if he's OK. Apologise for not being there and tell him that you hope he's coping OK. If he starts to talk down to you, remind him that we've all been there, this absence is inconvenient for you both, but that it happens.
If this guy is not senior to you then you need to mirror back to him the manager position he tries to adopt with you sometimes.
Somehow, between your own insecurities and his need to prove himself (through HIS own fears and insecurities) he is making you feel inferior, and you are NOT.
Buck yourself up girl! 