“Help me understand” opens a door that “that makes no sense” slams shut.

The same disagreement can be delivered as a request or as a verdict. A verdict tells the other person you have already decided they are wrong, so whatever they say next is a defence rather than an explanation. Asking to be walked through it keeps you free to disagree afterwards, and often reveals the piece you were missing.

Swap the phrasing once this week, in a class or at home, when something somebody says strikes you as obviously wrong. Hear the whole answer before you respond to it. You will still be allowed to think they are wrong, and you will know more when you do.