Right now only one rule keeps coming to mind. And it comes from a verse, taken out of context. Jeremiah 10:24a (you always know a verse is out of context if a person narrows the reference down to a or b!), New Living Translation:
“So correct me, Lord, but please be gentle.”
Ever since I read that verse, I’ve thought, if Jeremiah could ask God to be gentle in His correction, can’t I make the same request of other people. I hate to be corrected, even while I welcome it (I really do want to be able to see things from other people’s perspectives, even though at first I don’t always look like I really wanted to hear whatever correction has just been handed out!) But, I realized, when correction (or even just a differing perspective) is given, that a gentle presentation helps a whole lot. It helps me hear what you are saying and not cower because of how you are saying it.
I don’t always do this perfectly myself, but I do try. And that is the “rule” I’m asking be followed here–try to remember to be gentle in your presentation–whether you are disagreeing or think I (or another commenter) is totally in error.