I don't think those saying the earth is flat understands what it means to be flat. The earth is spherical, stop propounding new theories that does not fit.
Flat Earth is not a new idea.
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There is no buoyancy without gravity.
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There is no buoyancy without gravity.
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There is when the effects of Earth's electric field are factored in, gravity is an unproven theory used to promote the idea that there are heavy balls in the sky. We're inside a closed system and the Sun, Moon, Stars and Planets are all projected lights off a mirror, not dense objects in need of a magic theory to support them.
Plato's Allegory of the Cave by Murderess-of-Shalott