You put that question to him very delicately and non judgmentally.
Years ago, my older brother approached me very aggressively. I didn't know at the time he was just trying to wake me up because he loved me and wanted to get me out. I felt like he was attacking me and so I just blocked him and everything he was telling me out. Had he approached me differently, it may have been effective. So I just remembered that experience and tried to do the opposite with my younger brother hoping for a better, open outcome in establishing some dialogue.