I'm currently a grad student in a moderately large department. I share an office with a few other grad students, and I get along with all of them fairly well. However, one of my officemates is rather loud and unfiltered with what he says in and around the department. The office walls are very thin, they are movable partitions, and the professor next to us clearly dislikes the noise and behavior. I'm very concerned with how this may be affecting my reputation around the department. I like my officemate, but the immature behavior is very noticeable.
How should I deal with this situation? I can't really ask for a new office, but I don't want to be associated with the poor behavior. I've talked to him about it, but I don't want to constantly remind him to be quiet or conscientious of other people. I am at a loss with this situation. Any suggestions would be greatly appreciated. Thanks.