The best definition of 'art' that I've heard is "Does someone call it 'art'? Then it's art". Every other definition I've seen put forward has its exceptions. Using this definition, you can't separate out 'real' art.

My own personal working definition of art is "does it make me think or feel something other than questioning the skill of the creator?". This sets a pretty low bar, but still cuts out those things like the 'artists' who just nail up a sheet of plain paper and call it 'untitled'... yes, very funny, moving on.