Not a flat Earther, but their usual respond is to look up at the wiki or:
If the Earth is flat, then why do ships appear to rise out of the ocean? I've always thought this was due to the curvature of the earth.
Because we can't see forever by the law of perspective + lots of air blocking the ship.
This picture here (https://i.ytimg.com/vi/2LWIGKnsnXY/hqdefault.jpg) shows how flat Earthers believe the sun works. According to this, the sun is shining over Western North America and Eastern Asia. Why can't Africa see the sun?
Just like above, Sun is blocked by air, something about bendy light and that light can't travel forever because they will disappear.
Why do constellations and planets move around in the sky? if the earth was flat, we should be able to see the same constellations all the time; however, this is not the case. for example, around fall, you can see the constellation "Orion" in Eastern North America. As spring and summer draw nearer, Orion slowly disappears over the horizon. Please explain.
Because they rotate at different rate than the Sun
BONUS
If you've ever looked through a telescope at other planets, the moon, or the sun, you'll notice they are all spherical. Why is earth the only exception?
Because Earth is not a planet, just like humans and cats have legs, but snakes don't.