Not attracted to the ground. All mass is attracted to all other mass in the universe over an infinite distance. The earth is just the closest very massive thing to us (obviously) and the effect weakens with distance. It keeps us on the earth, it keeps the atmosphere in, it keeps the moon in orbit around the earth and the earth in orbit around the sun.
I also don't think it's in any way reasonable to doubt relativity or gravity itself without offering some good reason. That poster does not have a good reason.
Urgh... read carefully. I only mean what I say, I don't imply anything. I am a student of Theoretical Cosmology so I very much know that. Yes NG states that all masses are attracted to each other but the everyday phenomenon of gravity, that which can be observed in every day life is that objects are attracted to the ground. Also I did not state that it was reasonable to deny GR or NG just that it was possible without having to deny your own senses.
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