@thelinuxEXP Absolutely! I believe that the CoC created by Mako for #Ubuntu was one of the big draws for many of us contributors.
A minimum set of guidelines setting expectations of behaviour is an entirely reasonable thing.
We have had CoC's in the real world for years. Talk smack in a pub, and there will be consequences. The same goes for schools, the workplace, and public transport.
Online is no different. It reflects the real world, though. The real world is full of people who differ.