A quick guide to why "mythbusting" might backfire.
If you search the internet, you can find the top 5 myths about everything from coal to vaccinations to organ donations." (My favorite was put simply: "Portland, Oregon: myth or reality.) While these lists point out harmful misinformation, they can also reinforce the misconceptions they are trying to refute.
"The Debunking Handbook" is a helpful publication written from the perspective of a cognitive scientist that explores why such tactics can backfire.
People tend to believe ideas that are familiar. If you hear something enough, you begin to trust it, especially if it makes sense. By repeating the misconception, these lists of myths can make the wrong information more familiar, and this feel more accurate.
Another interesting idea is that for some someone to make sense of a negative statement (such as vaccines don't cause Autism), their brains first think of the statement as being correct. Consider this: "There is not a loaf of bread on top of your refrigerator right now." The first thing your brain does is imagine a loaf of bread on top of your refrigerator, and then removes it from the picture. The very act of thinking that something is not true creates an image of it being true.
The handbook gives helpful tactics for effectively challenging misinformation, including a process for replacing incorrect ideas with more accurate versions: "When you debunk a myth, you create a gap in the person's mind. To be effective, your debunking must fill that gap."