I'm going to keep shrugging when my roommate complains to me about her druggie boyfriend's issues
That's a lot to take in. Is this an ongoing issue?
Yes, I do it all the time and it's annoying as hell.
Tell your roommate you are not interested in topics irrelevant to your life. They're her boyfriends issues, not yours to fix.
I'm not going to do that, she doesn't seem to understand things. This way it's funny and she has to deal with my nonsense.
Sorry that you have to constantly listen to her, but she confides in you so can you try to be a little more sympathetic, even if you don't really care? If you try to listen, maybe you'd actually find her problems interesting and genuinely try to help her out!