Konishikawa and the manager drink like people in my family. That's going to be a scary bill, but it's nice to see someone who doesn't forget what they did while drinking for once in a manga.
Honestly, I'm kinda disappointed that this is the reason the way he is. Or maybe it was the delivery? I dunno something about the build up, made the mystery fall flat.
I wonder if Konishikawa said he didn't like Misato, if everyone would tell Misato to f*** off too.