Well just be classy about it. We don't need to be all No Fun League with mods acting like Roger Goodell's.
Those who are correct in a debate should be allowed to say "oh hey I was right" in some form, while not being a prick to anyone. However EQUALLY SO, those who were wrong need to be held to the same standard, where they need to say "oh hey I was wrong" while not throwing a god damn hissy fit.
No need to target one side here, if that's where we're heading with moderation.