I don't care if those people are insulted or not. I post the correction for everyone else who has to read it. People have a habit of believing what they read. Whatever nonsense was posted by the original poster will likely get shared onward by someone else, either on Facebook or in real life. I figure that correcting it up front is doing a favor to all those people, even if the original poster gets their feelings hurt from their embarrassment. There's already too much misinformation out there.