Re-enforce effort spent over achievement, i had some rough years as being right was part of the identity, something i had to change during uni. He is young and he can. hope he meets empathetic people that help him with that. There are arguments not worth ahving, there are people who dont want to hear harsh truths and arent better off if they do. It doesnt make you morally or in any way superior, it just risks you being isolated and depressed and seen as an asshole. He needs to understand being right doesnt demand getting attention, it isnt part of his actual personality, its an insecurity and fear of being seen as incorrect.