They start off immediately on the wrong foot by not specifying and agreeing on what "civility" is.
So I really can't find any value in what they say as they've failed to define the term over which they are talking about and when they DO back into a definition it's either one I don't agree with or far too narrow a facet of the term as to be useful for the purpose of their discussion.
Civility is a mindset - not a mode of speech. Civility pays respect, whether amiable or wary, to the position, attitudes and methods of your opponent. You may not respect all 3 at the same time but respecting any of the 3 governors your behavior towards them.
So, when Dems were in power, I didn't respect their attitude and their methods were spotty here and there but I respected the position of power they held. By "Respect" I don't mean false deference, but acknowledging the power, significance, or bearing that they held at that point in time. We were in the middle of a vastly different type of cultural movement during the Obama years and disrespecting the tidal flow of power dems exercised over the federal and state governments would have curried no favor, changed no minds, and become an obstacle to my own personal education. It's why current Republicans in Congress look even more pathetic. Their entire effort was spent in thwarting Obama and shoveling mud at him that they failed to unite and form a cohesive plan of what to do when they regained power. Their disrespect was only toxic to their own goals when it came to policy.
To me, civility matters not just because of the golden rule but because I find it a tactically defensible mentality.