As Jesus is the cornerstone upon which the Church is built, so are his teachings the unifying cornerstone of Christian doctrine.
In Matthew 5:39, what did Jesus say about responding to an insulting backhanded slap on the cheek? He said to turn the other cheek, not to retaliate but to humiliate ourselves by allowing further slaps. Even the business world understands that the best thing to do with a customer complaint is to allow them to vent without interruption, to get it off their chest. Give them time to calm down, and after having a hearing, many become a more satisfied customer. If even the carnal world understands how to win people, by respectfully giving them opportunity to fully complain, then how much more should we take insults in order to win peace for Christ.