Very disrespectful, given your desire to maintain an alcohol-free home.
As the child and sister of alcoholics, though--remember alcohol is right outside the door.
Having it in the house does not make things more dangerous, really. Especially if you pitch it when the boor leaves.
I mean...of course. Have your house the way it makes you comfortable.
The one family member who achieved and maintained sobriety in my family, though, would be the first to say that it's no one's job but HIS to steer clear of alcohol. (This family member lived with our 2 floridly alcoholic parents--and maintained his sobriety nonetheless.)
Some say trying to control the environment is akin to enabling. Yes, it's positive behavior--but it's taking responsibility for someone else's sobriety. Only your son can manage his sobriety.
(Still, I am all for an alcohol free house and at any given time am quite likely to have one. Please don't interpret this as any more than another perspective. I support YOUR support of your son.)
Know that I am caffeine-free. This is why I am as clear as mud. My point is that there's not much point being upset with someone who really doesn't get it. And alcoholism is something most people just don't get. You'd THINK they would, given the prevalence. But even those who've lived with alcoholics usually have no clue how to appropriately confront it.