This is a lost art, by the way. As a disagreeable person, I may be biased.
This thread is inspired my interaction with a colleague with whom I never agree with on how to approach a situation. But what's awesome is that we maintain a complete level of respect of each other, have never personally attacked each other, and maintain a level of mature discourse. How long can you go without insulting the person you're arguing with? Hopefully a figure that's in years instead of minutes. Virtually all political leaders have failed us in this regard.
But we can be better. Please share your own personally story.