Many times people feel that "they can't reason with others," but the problem is often not about how well you express yourself, nor about whether the other person is smart or not, but rather that your words simply haven't entered the system that truly works for the other person. In other words, your logic hasn't found the "effective entry point." First, the rules are different: you are using facts and logic, while the other person might be considering stance, identity, or emotions.