This reminds me of when I attempt to send a Snopes link to someone who just forwarded me a chain email. They don't thank you, you get silence or worse.
Yeah, people don't like being corrected when they are wrong. I've bumped into that a lot when discussing things on social media. I find that if you can manage to spare someone's ego when correcting them, it helps a lot. Rather than sending a link and saying something like "You're wrong!" If I can give them the opportunity to decide for themselves that they are wrong, by saying something like "Are you sure about that, this guy is saying something different," I often get a better response.
There's a rabbinical art to being tactful that unfortunately eludes me. The effort is usually wasted on internet discussions.
In more controlled, personal settings my favorite response along that vein is "what factors did you consider that led to your conclusion?" It's a less offensive, more roundabout way of telling someone that their assertion is questionable that also betrays their thought process.
