Don't argue with each other: when you meet unreasonable people, you must not argue with them, because they are unreasonable, you don't need to talk to them, and you can't argue with unreasonable people.
Listen more and talk less. You usually know that the other person is unreasonable, so listen to him more, don't talk, and don't participate in the argument.
Stay away from them: if you meet unreasonable people, if you are friends, you should have less contact and less trouble.