FWIW...I don't think he was drunk...IMHO he was stone cold sober...he uses the "I'm drunk" statement to try and insulate himself from the Hitlery and Barakstar! factions within DU and the rocks they could potentially hurl at him.
Yeah, I suspected that too.
I'd hesitate to call the Bostonian "stone cold sober" when he wrote that, but it has a different flow, from when the Bostonian Drunkard is in his cups up to his elbows.
Over time, the body builds up a resistance to the effects of alcohol. The boston drunkard probably requires a TON of booze before he hits theouter edges of what most people would call "drunk."
Note he doesn't transpose letters or words and his over-the-top (*yech*) purple prose style is very much in play. He doesn't seem particularly angry.
Overall, he was probably drinking all night (why any adult would brag about that is beyond me, unless it is, as suggested "plausible deniability."), but he was on the down turn (sobering up with a few beers) and wanted to leverage his situation.