Be careful throwing the insult darts around you may hit your ball Earth theory and let all the air out.
Looks like someone goofed already and hit your Flat Earth. It has gone flat already and the theory is rapidly deflating too.
And I have always said about that Flat Earth logic boils down to "I don't understand xxx
[1] about the Globe, so the earth must be flat!"
As an example, you ask "If the Earth is a ball why don't we fall off the bottom?" Well, have you ever heard of "gravity". A bloke called Newton sort of tied it up, but his work was based not only on his own observations and experiments (with pendulums, falling weights etc), but the observations of many others including Galileo and Hooke.
There was no
direct evidence and the value of Newton's "Universal Gravitational Constant", "G", was not know till around 1799 when Henry Cavendish perfomed his famous experiment.
Now if that was a "one off", it would have been dismissed as a fluke, but similar experiments have been performed many times (possibly a hundred) and have verified Cavendish's result to within about 1%.
It does seem interesting that very few if any of the "Flat Earth Hypotheses" have ever been verified by experiment - they just "popped" into someone's head!
So the simple answer to "If the Earth is a ball why don't we fall off the bottom?" is gravitation![1] Where xxx is any little bit of the Globe model their tiny minds can't grasp.