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Second, sokural is correct about magic dirt. FE by claiming that the sense of gravity on Earth is caused by a uniform acceleration of the Earth upward must claim that the Earth's dirt has a very magical quality: While it always attracts other matter when consider unit by unit, it fails to attract other matter when we consider it as a whole. So twice as much dirt has twice the attraction, and three times the dirt has three times the attraction, and so on. But when FE talks about the whole FE suddenly the dirt stops attracting. Magic!
No offense but I have no idea what the hell you are saying here. Can you run this “magic dirt” thing by me one more time… 
Sure thing. It's complex, and I took several shortcuts in explaining it. Sorry.
First, FE has a problem with gravity. The force you feel that keeps you on Earth is caused by two very different mechanism in the two models. RE, as you probably know, relies on gravitation. The mass of the Earth attracts other masses, such as you and the Moon. Newton's model, with improvements last century by Einstein, predicts this force quite accurately. Now FE can't have the same force. You see the disc shape would cause significant variations. Basically everyone would be pulled toward the North Pole. In the early days of the Forum there was a debate on how best to confound the REers in dealing with this problem. The decision, perhaps unwise, was to have the FE accelerating upwards at a constant 1g, and to have no regular gravity (for the attraction of the Earth's mass). You may recall the weak Equivalence Principle of Einstein's General Relativity. Basically, you can't tell the difference between the felt force in FE versus RE--until you look at the secondary effects.
So FE holds that gravity you feel on Earth is caused by acceleration, and, by necessity, the mass of the Earth does not exert a gravitational attraction, or in Einstein's terms does not bend space-time. Now this would be okay, except for the secondary effects (tidal forces, variations in the force by altitude, by local formations, and by latitude) and the Cavendish experiment.
The Cavendish experiment uses sensitive torsion bars to detect the gravitational attraction between masses. So if you pick up a pound of dirt and place it in one side of the experimental device and place you in the other side. The dirt will attract you. If you add a second pound of dirt you'll be twice as attracted. And so on. And we've never tested any mass that didn't have the predicted gravitational attraction. Now FE argues that these myriad of tests do not predict how the whole Earth will behave. They insist, rather inanely, that when all these masses are taken as a whole instead of adding according to Einstein's model, they no longer attract, denying the laws of logic and physics. Hence the term: "magical dirt"!
I hope that helps. Please follow up with any question or concerns. I'm happy to help!