GUEST'S ANSWER: Christina Nihira, local community volunteer and newspaper writer: Telling someone that they have a poor personal habit presents a difficult workplace situation. It is obviously becomes more complicated given that the person involved is your supervisor. Yet, that should not deter you from being informative and assertive.
Ask to speak to the boss and meet in a spot that provides privacy. Be direct, empathic and most importantly, relaxed. You need to deliver the message that you feel concerned that this issue is having an impact on his ability to interact with co-workers. The offensive behavior may not resolve immediately, but if the person really cares about the department's cohesiveness and productivity, he will take strides to improve the work environment.
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