Well, I have experienced first hand that taking the time to write constructive posts can change people's mind. Whether it be flat earthers or deniers of evolution or climate change.
While it is tempting to just ignore people, I think some of these issues are too important to sweep under the rug. Part of my motivation to start blogging and communicating about science is to help educate after all. I think it is often a lacking educational system, and a media that is very poor at communicating science, that is to blame (Don't hate the player, hate the game huh?). So someone will have to pick up on their slack!
I'm thinking the same. Always keep your cool and come with constructive communication. Thumbs up for the initiative. They shall not be ignored because in the end it will have the snowball effect, like it has now. More and more come with strange ideas.