yeah, you have to hate Kant ... it's one of the prerequisites for modern thought. Everything written in the field since Critique of Pure Reason has been written because of the author's hatred of Kant.
That aside, I don't think the "law of gravity is nonexistent" argument is logically sound. It relies on equivocation of terms within different circumstances. It supplies criteria for evaluating the existence of concrete instances of a thing, and tries to apply them against a Universal property.
-sm
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