I know that some people are not as straightforward or they don’t like confrontation. I think college is one of the best places to mature and develop yourself as an adult. As hard as it is, try to gain the courage to have these conversations and learn how to set boundaries. For people who are more reserved, just calm down and breathe. Remember that you both are living in this area and you both have a responsibility to keep it clean. You addressing the problem is not demanding; it’s understandable. At the same time, try not to be rude because no one likes being told what to do. Express your feelings, but phrasing is important. And avoid addressing them over text, where things can easily come off as passive-aggressive and tone does not translate.