“Never hurt your own feelings.” Don’t take offense when none is intended, and don’t analyze interactions in search of slights and insults.
“Don’t borrow trouble.” The world has a vast surplus of problems and conflicts that you can’t avoid. Don’t compound this by taking needless actions that’ll have detrimental effects.
“Never try to reason with someone who’s being irrational.” Banging your own head against a wall is less frustrating and more beneficial.
“There are at least 3 sides to every conflict.” Party A’s version, what Party B says, and the reality.
“Never try to placate a bully.” Bullies smell blood, and they view sanity and reason as weaknesses. The only things you can do are: (1) retreat and avoid (best), or (2) let yourself be bullied (worst), or (3) stand up for yourself and fight back (a challenge, but often worthwhile).