All I know that for years looking at my Dad's stashed Playboy magazines, once I became a "man" I was not disappointed. Obviously my point being is that comparing any architecture by Gehry or the Abbey or Machu Picchu....if I am looking at any of those architectural wonders in person, it is all good! But, if I were gonna ARGUE with that guy, I would have brought up the fact that some consideration should be taken into account for geographical point of reference. Active civilization had more of a scientific database in Europe at the time the Abbey was constructed versus Machu....(not really knowing all of my history so not sure if the Aztecs influenced any of this in Peru).
Regardless, the guy sounds like a snob and "on second thought, let us not go to Camelot. It is a silly place".