With that dumbfounded look, holding from earlier, "But.. why did you throw open the door then? If you don't care, seems like a lot of effort."

With a sigh, "Look, we're in the same band and have to work together, shouldn't we kind of try to get along? I can keep my crap in my room. When you're here, anyway."

Once in a while logic and willingness to compromise strikes the mind of those who may appear allergic to it. But only once in a while. And he'll honestly try if it's on the table.. doesn't mean it'll happen all the time, but it'll be a valiant attempt!