say I’m a flat earther, I say you look at the oceans and they’re flat, and you look at water and would expect it to just spill over (how can it be flat on a round earth? it makes no sense how the waters look on a round earth…)

or say you acknowledge that the composite images of the “Blue Marble” view of the earth have been faked: https://qz.com/192700/the-guy-who-created-iphones-earth-image-explains-why-he-needed-to-fake-it

how do we know the earth is the shape it is then if people are not honestly giving photographic evidence of its shape?

Or say with GPS, I say that could be done on the land, there is no need to rely on satellites. Then how do we need to believe in satellites orbiting the earth, when land operations are sufficient for explaining them?

Or say someone says they don’t know why people are lying about the earth being flat, when we know it is. What are they trying to hide by lying about its obvious flat shape?

and so on, to give you an idea of how a conversation might go