I'm going to cut this kid a break. Having Kim for a mother surely messed with his coping skills. I could see it being his way to remove himself from the chaos.
In my experience with 2 alcoholics in my life, it is one of the reasons. The other is that it is tasteless/has a milder taste therefore they can drink it quicker.
I am pretty certain it was closed to her only. I have never seen a bar or lounge shut down at night unless everyone is gone (thinking of the table that she was harassing).