The most difficult thing to accept for people who work hard at forming their beliefs on the basis of evidence is that not everyone forms their belief… - Peter Boghossian

Seemingly impossible conversations typically have one thing in common: they're about moral beliefs rooted in one's sense of identity, but they play out on the level of facts (or assertions, name-calling, grandstanding, threats, etc.). [...] The most difficult conversations, then, masquerade as discussions about something other than morality, but they are actually about what qualities, beliefs, attitudes, and behaviors individuals believe make them good people or bad people and why it is important to hold the right views among those.

A criticism of an idea is not the same as a criticism of a person. [...] Ideas don't deserve dignity; people deserve dignity.

Most basic elements of civil discussion, especially over matters of substantive disagreement, come down to a single theme: making the other person in a conversation a partner, not an adversary. To accomplish this, you need to understand what you want from the conversation, make charitable assumptions about others' intentions, listen, and seek back-and-forth interaction (as opposed to delivering a message).