What do flat Earthers think causes the "magical downward force"?

I have heard them say:

4. Gravity doesn’t exist - things are held down by air pressure.

1. Gravity is real - but the Earth’s disk is very thick so the force is very nearly vertical.

Why did it take seven days for troops with helicopters, equipment, supplies, food, and water to be dispatched to southeast storm zones?

If (1) was the case - the center of gravity of the Earth would have to be so deep down to avoid gravity pointing off at an angle when moving towards the “rim” of the flat earth that the difference in height of a mountain would be negligible and we would get very, very nearly the same gravity everywhere.

If (2) was the case - then the acceleration would have to be EXACTLY the same everywhere - and it’s not.

They don’t know - and not all of them agree that there is a “magical downward force”.

What happens when your partner doesn't see the value in you and continuously hurts you by searching for something in others knowing it hurts you?

The trouble with (1), (2) and (3) is that these cannot explain why the force of gravity varies with height above sea level…less at the tops of mountains - more in valleys.

If (3) was the case - you’d have the same problems as (1) - but this weir...

3. Gravity doesn’t exist - it’s a form of magnetism that works on non-metals.

Joe Biden is not the best president we had. That would be John F. Kennedy. How is voting for Donald Trump any worse than voting for Joe Biden?

2. Gravity does not exist - the Earth is accelerating upwards at 9.8 m/s2 which seems like gravity.

…and there are probably other ideas out there.