Try changing a flat-Earther's mind using rhetoric, reason, and facts. Probably not going to happen. On the other hand, geocentrism took a long time to die, but

Try changing a flat-Earther's mind using rhetoric, reason, and facts. Probably not going to happen. On the other hand, geocentrism took a long time to die, but when it did, it wasn't because justice warriors were shouting louder (though many tried); it was simply a fact that could be independently verified by more and more people. Real scientists don't launch marketing campaigns when they've made a discovery. They publish it in a journal and invite others to verify (or disprove) their findings. You don't change people's minds by telling them what the truth is. You show them how to discover the truth for themselves and let them draw their own conclusions. But don't take my word for it :) Look for the pattern in history and you'll see.