When Should Doctrine Divide?

For various reasons I’ve been thinking about how Christians should relate to each other around secondary doctrines. What partnerships and alliances are appropriate among Christians of different denominations, networks, or tribes? What kind of feelings and practices should characterize our attitude to those in the body of Christ with whom we have significant theological disagreements? What does it look like to handle—with integrity and transparency—personal differences of conviction that may arise with your church, boss, or institution?