It was more of what was on his mind than any outburst.
I don't think he would say that sober, but do think some of that is what was on his mind and heart splattered out of his mouth with the drinking.
I've known two people who became entirely different when they drank too much. A couple decades I knew them both and never saw them drunk (maybe because I no longer drink). When finally seeing them drunk, they were completely out of character. I still know one of them and she's still the lovely person I always thought she was. There is no proof in one incident and I won't judge someone that way.