Medics have their own version of this. A Dean told me long ago that medical students have minds like sieves. They only retain the coarser material. I can certainly remember the stinging, albeit funny remarks made by my teachers forty years ago. Proverbs is full of warnings and good advice about the use of the tongue which we do well to ponder.
Some words are arguments in themselves.
Think of 'Dour Calvinists', 'Woolly Charismatics', 'Fenians' if you're Irish. Thirdly we are redeemed. We are talking about when Christians disagree. God in his mercy has called us out to be his children. Yet in a strange and sad way this makes the situation worse when it comes to disagreements.