I have to laugh at the "bendy light" stuff. Sure, as I pointed out on that site, light does indeed bend. What it does not do is bend without a proper reason.
High levels of gravity can bend light. Light also refracts when moving from material to material because of the difference in speed between those materials. But light does NOT mysteriously bend for no reason. If it did, scientists all over the world would have tried to explain it.
And on the note of scientists all over the world, I would have to say that if there is one thing that disproves flat earth beliefs, it is this: For the earth to be flat, it would require a HUGE portion of physics and math to be completely wrong. And yet, many of those same mathematical proofs, and physics theories are perfectly capable of describing our world. I mean, spherical mathematics alone essentially proves the earth is roughly round, not to mention all the other physics theories that in some way require earth to be round (such as most stuff dealing with astrophysics, to name a small example).