Anyone who mocks "Intellectual Property" as "Imaginary Property" while supporting the GPL must be completely clueless.

The GPL benefits from the concept of "Intellectual Property" just as much as any other license. If you don't think that "Intellectual Property" is a valid concept, fine (although you've probably never created anything that someone else would want to put their name on), but it's inconsistent to be anti-Intellectual Property and pro-GPL.