The difficulty in actual interpersonal relations as opposed to philosophical procedure is that there usually really is more than one thing under discussion than just the logic of it all --- "I disagree with you because..., AND the way you said that makes me feel..." and they often get tangled up, especially if they don't necessarily come out in the right order. Both legitimate points of discussion, but...
Theoretically, if you're writing, such as in a post to the 'Cat, you have time to stop and think and parse it all out properly. (Ha!)