We have a foreign boss, he isn't very receptive if we broach subjects with him about his mannerisms. However he has been very interested in learning different colloquialisms or idioms. We have been using this as a way to broach hard subjects with him, like when he is being rude.
For instance he has a habit of walking away when someone is speaking to him, is there a saying that we could say in this situation? When he asks what that means we can explain he is being rude by not listening to someone.