Kherbert, your neighbor reminds me of a roommate I had. She didn't want to drink alcohol or be involved in any way. I thought this was completely reasonable, so I always drank at someone else's place and didn't come back to the room until I had sobered up. I would always enter the dorm quietly without turning the lights on so that it wouldn't be a problem for her. She never woke up once.
Despite this, she still had a problem with me drinking, and seemed to think that I was an alcoholic. This made no sense, as I really didn't drink all that much. Most of the time, I would hang out with my friends, have a couple of drinks, and not be drunk at all. She had a very black and white view of the whole thing, and her in mind, anyone who drank even once a week was an alcoholic.
She was also pretty sheltered about alcohol and clearly uneducated about how it worked. She did not understand that there were levels of intoxication, and that you could be a bit tipsy and giggling without being completely smashed and passing out. One night, I crept back into our room after a party. As usual, she didn't wake up. The next morning, she tried to trick me into thinking that I had a problem, saying that I had busted into the room yelling at the top of my lungs, waking her up. Obviously, this didn't happen. She kept insisting that it did happen, saying that since I had been drinking the night before, there was no way I could have remembered what had really happened. Since I knew that I hadn't done anything wrong, I continued to ignore her objections. We didn't last much longer as roommates.
Some people have very strange ideas about alcohol!