Sometimes, Even If Your Right, Words Can Make Matters Worse.
When people fight, of course they're going to be stubborn with what they think. Depending on their position, most of the time no matter what you say, they're going to go against it and not listen to a single word you say. So, why waste your breath ? If your in a confrontation, simply say what you think and walk away. Don't physically fight, that's the worst solution possible and it nearly never clears things up. Most people realize things when they're left to actually THINK about what you had to say, and that usually doesn't happen through words coming out of YOUR mouth. & saying, "I told you so", or shoving the fact that they were wrong into their face once the conflict is sorted out, is just asking for the fight to be reopened.