I have been told, quite directly--in fact, that my facial expressions are often my downfall in this regard. I have a terrible poker face and must project either an impatience with or a lack of regard for what a person is saying. I know that impatience is a problem limited not just to myself, but my family. Often, our conversations tend to have us finishing each other's sentences, not because we agree, but because we know where the conversation is leading. Perhaps that's a problem with how we tend to think in general ... always looking several steps ahead. This might make us impatient with conversations which often lead into inevitable directions.
I know that this goes beyond my face as it's certainly an issue in written correspondence as well. While this is especially true in social media, it creeps into my emails, and even some of my online class discussions. I think it might be even harder to convince someone using writing as people tend to be on the defensive when reading to begin with. Still, it is frustrating to take the time to put research and write on an issue only to have it dismissed so easily.
I may never be able to figure out why I'm not more convincing, but it would be nice to be more persuasive in my dealings with others.
... I suppose I'll just have to settle for knowing that I'm always right ...