I have a question, if the earth is flat, why is it every planet and star around us is a sphere? What makes us so special?
I was certainly expecting a stronger argument, but here it is:
Q. If the planets are round, why isn't the earth?
A. The earth is not a planet.
Flat Earth Society arguments can tend to be very vague and not really thought through when pressed for clarity.
This is by design; Most Flat Earthers (as I have seen on this forum) will admit that they really don't know what their Flat Earth Model truely looks like. And so, such short and quick responses are a way to answer your question without really answering your question.
In many other cases your dealing with religious beliefs.
The belief in a Flat Earth will likely diminish within the next 1-2 decades, as advancements to space / space travel evolve to where people going to space become more common; the evidence will become so overwhelming and obvious that Round Earth will no longer be a hoax but accepted as fact.
What we are seeing now is the tail end of a society of remaining hoax believers that are clinging to every bit of evidence they can find to support their theory and try and make sense of what is happening on the world today.
It will just take a little more time.
Once this happens, hoax arguments will likely evolve.
I think it would be interesting if NASA, SPACE X, etc.. just ask FE's like 'Mad Mike' Hughes if they want to train for the next space mission and then leave an open seat invitation or reservation. Maybe even include seats for 2 FE folks so that they can report back on the Earths observed Curvature. Of course, the FE'er that went to space and reported a curvature would attribute it to them being drugged and put into a hallucinating state.