The problem with this is that 'masculinity' covers a huge number of traits, from those which are objectively masculine, through those which are typically accepted by most of society as masculine, to those which are considered masculine only by certain sets of people. Is having an XY chromosome pair masculine? Yes, objectively so. Is being tall and broad shouldered masculine? I think most people would agree it is as these are characteristics that are sexually selected for in men. Is being aggressive masculine? Some people would say yes, others would say that masculinity means having confidence and restraint instead.
The other problem is that the original poster seems set on dismissing any view that isn't in direct accordance with his own as being 'PC' and therefore invalid.