I would say "I like mine better cause it's not a fake"
As much as I would be dying to say something like that, I could never!
I am totaly against fakes, but alot of people are really ignorant and actualy think that their fake is real, that it 'fell off the back of a truck' or whatever stupid reason!!
I would ask where they got it from and just say 'oh yeah, good for you; or something!