Is it normal that my roommate listens to classical music whenever he’s drunk?

Every so often my roommate will go into his room with a couple of beers or a bottle of wine or whatever and just listen to classical music all night while getting drunk. It’s not necessarily a problem because he shuts his door so it isn’t too loud when I’m trying to sleep, it’s just weird. He doesn’t really drink otherwise with me or with anyone else, he just drinks in his room by himself listening to classical music. Is that normal?