Another valuable principle to put into practice from Dale Carnegie and the book "How To Win Friends and Influence People" Getting the other person to give you a yes will always help your disagreement go better.  

Courage Cast - Build Your Belief

190 - Dale Carnegie: You'll Have More Success If You Start Out Getting a "Yes"

Encouragement builds belief. Belief makes the impossible, possible. This podcast exists to encourage others so that more people will believe in themselves. Listeners will find the courage to face their fears and commit to taking action, so they will be unstoppable. Host, Eric Nordhoff, is on a mission to encourage business owners, entrepreneurs, and creative people. This podcast features faith-based motivational messages and interviews with overcomers who have inspirational stories. Find out what it means to live your most courageous life by joining the Courageous Community. Live a life with purpose and intention. Make the impossible, possible in your life...