paper-mario-wiki:

when youre talking with somebody about things you like and you come to a disagreement, dont treat it as a debate if you fear a conflict. even if you do treat it as a sort of debate at first, if you see yourself getting a little too heated, back up and take a moment to say “this does not make them a bad person. my opinions do not make me objectively better” as long as the debate is about something ultimately inconsequential like cats vs dogs or cake vs pie or the controvery surrounding the star wars prequels.

dont say “youre wrong”, say “i see” because the amount of those debates you “win” will not be as gratifying as the amount of conversations youre able to walk away from where both parties are happy with how the conversation went.