The volume comfortable to one listener can become another person’s whole room.

People do not receive sound at the same size. What sits pleasantly in the background for you can fill somebody else’s head completely, particularly if they are tired, in pain, hard of hearing or sensitive to noise. Neither of you is wrong about the volume. You are simply not in the same room in the sense that matters.

Ask rather than assume when you share a space, and ask in a way that makes it easy to say too loud. If you are the one being flooded, you can say so early rather than waiting it out. Turning something down costs almost nothing.