I have, and the arguments fall flat, are disproven, and just simply make no sense.

Go stand on the US East Coast with a portable telescope and tell me you can see the European coast line. If sea level is flat, then there's nothing obstructing your view. It will be small, since it's so far away, which is why you need the telescope. But, if I can see the rings of Saturn with my telescope, I can sure as shit see another continent...except, you can't, because the curvature of the Earth prevents it. Watch a ship come up over the horizon, or go down over the horizon. Either way. You won't see it just get smaller and smaller until you can't make it out anymore; you will literally watch as the ship appears/disappears gradually as more and more of it becomes obstructed by the curvature.