Based on John Cook and Stephan Lewandowsky's The Debunking Handbook
Correcting or "debunking" misinformation is challenging, in part because people are more likely to believe information that is familiar, even it they learn later that the information is incorrect (sometimes called the "familiarity backfire effect."
Research indicates that when correcting misinformation, it's best to first introduce core fact before presenting the false information that needs correcting. After presenting the misinformation, explain how the information is wrong and provide an alternative explanation. The Debunking Handbook (p. 6) identifies four key parts of debunking a myth: