Uh - for one you are not bad with time management, don't let him let you think that. He's the one who took forever to get his house together so that Nathan and Sydney could finally spend the night there. You have more time management in your little pinky than he has in his entire body.
His reaction is pretty typical. He's lost his "control" over BBJ and he doesn't like so he's going the route of "you're a bad person, a bad mother, etc". Don't let him suck you into it. As I meant to say in my previous post - these types of "emails" need to be Ctrl-alt-deleted.