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>Have/make a friend who likes to travel
>Have friend travel to a place very far East or West
>Wait until it's noon for you
>Video call friend
>Have friend show you where the Sun is for him (if it is even day for him)
>Note that the Sun is in a very different position in the sky
This shows that the Earth is at the very least curved East-West which is incompatible with the flat Earth notion. On a flat Earth, it would be impossible for the Sun to be directly above one observer on the Earth and be on (or even below) the horizon for another observer also on the Earth. It is just geometrically impossible.
>but what if the light is bending in some way to make the Sun look like it is in a different position on the sky
That is incompatible with other observations of how light behaves. Light bending to make the Sun look like it is setting for you while it is above for someone else would require a mechanism that is dependent on the distance from the Sun and have it behave very consistently across varying atmospheric conditions. No such mechanism has been described ever that is consistent with observations of reality.
