You can just tell that the person only likes the artist for there art...
Has that ever happened to you? Has some random person you just saw compliment you like they know you and they JUST love your art...its okay if you don't know the person but they only say "that's good". But people talking like they have known you for ever and saying "ohhhh luv u!" even though you just saw them for the first time....it hasn't happened to me, but I know its happened before..
