If you've sat there and said to yourself that there is no need to talk to someone, because you know you are right, more often than not you've chosen wrong. Basically, a conversation, a discussion is nothing more than an attempt to gain perspective on a situation that people can't agree on.
Yeah even if you know you're right, everyone has a other approach on life. It is good to have another glance on the a situation, to learn how other personality react towards certain situations!