That's just it. We as humans are all bad at agreeing to disagree.
If you step away and look at things, you see that just about all of the arguing is one group trying to tell another group how to live their lives based on their personal beliefs. And yes, everyone does it. Your side, their side, that other side, those weirdos over there...
I used to think it was just my ex girlfriends who thought like this but almost everyone views "compromise" as "everyone does it the way I want".
The whole point of that ad was to start to change the tone of the rhetoric that invades everything these days and work towards "agreeing to disagree".