Before you start arguing, what if you asked the person on the other side; what do you want to know for you to change your mind? What proof do you want to see?
And instead of arguing based on how you both feel or one of you feel about the situation, you both argue based on facts, data.
And also be prepared for your mind to change just as much you’re willing to change theirs at the very least seek to understand what made them come to think how they think.
Frank's Blog 