I've commented on this post elsewhere, so I'll TRY to be brief, but as a sober member of AA, I must take exception to your choice of words; namely: "AA Lecture." My experience of AA has never included lectures. Lots of talking (sometimes rambling) and good advice, but "lectures;" not so much. (Perhaps the "rehab industry," which has dumped so many unwilling addicts and alcoholics into AA against their wishes, makes attendance at AA meetings seem like attendance at a lecture series for those who really don't want to, and therefore really shouldn't, be there.)
My experience of AA (including my own, personal story) HAS included plenty of denial, which I hear in the letter-writer's story and the responses to it. Also some enabling.
Selfishness and self-centeredness, heightened sensitivity to one's own needs coupled with massive insensitivity to those of others; these are just a few of the hallmarks of the alcoholic mind. Sometimes, because our enabling society says things like "oh, young people drink dangerously; that's just what they do," the moment of "pitiful and incomprehensible demoralization" that signifies the alcoholic's "bottom" is postponed, often with disastrous results.
"Demon rum" is just a poetic or high-flown and time-honored expression to denote alcohol and its well-known toxic effects on those who really shouldn't consume it. (And I'm not one who believes that NO one should consume it. Those who can, should go ahead. However, there are those of us who do not so much consume alcohol as have alcohol consume us. Unfortunately, it's hard to tell which kind of person you are until your life and the lives of others are heavily impacted, usually in the negative.)
Bottom line; the roommate sounds like an alcoholic, and the friend sounds like an "untreated al-alon." I hope they both get the help they need and that their lives improve.