The English 'cult of the gentleman' and its impeccable manners developed because our ancestors drank beer instead of water and carried edged weapons.
If you didn't want to get in a fight to the death over a minor difference of opinion or a misunderstanding, you communicated politely, respected differences of opinion, and wisely agreed to disagree. That pragmatic approach to communication is immediately conducive to constructive dialogue and an ongoing learning process.
I wonder if much of the shrill intolerance that we witness today stems from the fact that the chattering classes and most of the younger generation have never had to tread lightly around dangerous men.
They've never had to deal with the consequences of being a mouthy crunt. Nanny has always been there to save them from the bad man, wipe their arses and tell them they're speshul snowflakes.