The way to speak with flat earthers is not to debate them but to tell them off.
Like "What NASA and scientists are lying and creating round Earth photos? That's not an argument but paranoia."
"What? Gravity doesn't exist but things just fall down because there are giant magnets underneath Earth? There's no evidence for that."
"What? You say airplanes disappear when they arrive at Earth's edge and reappear at the opposite side? That is a nonsense."
Like "What NASA and scientists are lying and creating round Earth photos? That's not an argument but paranoia."
"What? Gravity doesn't exist but things just fall down because there are giant magnets underneath Earth? There's no evidence for that."
"What? You say airplanes disappear when they arrive at Earth's edge and reappear at the opposite side? That is a nonsense."
teachings of the Bible are so muddled and self-contradictory that it was possible for Christians to happily burn heretics alive for five long centuries. It was even possible for the most venerated patriarchs of the Church, like St. Augustine and St. Thomas Aquinas, to conclude that heretics should be tortured (Augustine) or killed outright (Aquinas). Martin Luther and John Calvin advocated the wholesale murder of heretics, apostates, Jews, and witches. - Sam Harris, "Letter To A Christian Nation"