A phrase I heard recently and found useful: I agree with the idea, but I disagree with the tone.
Many ideas get dismissed because they are delivered in a cocky or hostile or dismissive tone—or because of who delivers them.
Separate substance from style.
Some years back my wife and I got into the habit of asking each other
‘do you want comfort or solutions’ when the other was having a bad time. That one sentence can save us from an argument 9/10 times.