Should Flat-Earthers be debated or ignored?

[Anomalocaris]

Everyone's brain is composed of the same neurons and glial cells as everyone else's (excluding obvious exceptions). We all have a tendency to think the same way, come to the same conclusions, and make the same errors.

I disagree with labeling anyone as an "idiot." Mostly because it gives a false sense of security that our brains are somehow immune from error.

For me personally, concluding the earth is round requires making measurements and observations that I'm not in a position to make. So I welcome being questioned about something I accepted on the authority of others.

Our brains are not immune to errors.   But they are generally far less susceptible to error, particularly where that counts, than yours.