I'd contrast this approach with e.g. Product Hunt's community standards, where you're expected to be inclusive, make others feel good, and try to work as a group of makers who are "all in it together" instead of constantly arguing and putting each other down. Little mention of civility of the message delivery is mentioned at all - it's all about how the message affects the other person.
I know I'll get flack for saying this here, but I've found PH's approach to make far more sense and be 1000x better in practice.
(By the way, last I checked, I'm still ranked-banned for pointing out YC's reversal on their stance about board members, so this comment will stay at the bottom of the page no matter how you vote. - Edit, or the comment will tie for bottom of the page, along with the other rank-banned and dead users.)