Even if someone clearly is wrong, it is wise to not make them wrong. Everyone has a truth that's real to them. So in disagreements, it's always good to build bridges by first honouring the other's truth, no matter how distorted. Work to build a bridge by empathising with at least some aspect of what they're saying - even and especially when they're young and not yet emotionally mature. Begin by supporting and upholding their truth. I've found it's then much more likely they'll embrace aspects of your point of view. I call it building bridges.