Bullying's Like Art or Pornography

Sure, bullying ain't cool. But how does one *objectively* determine what it is? Seems a lot like defining art or pornography. All seems rather nebulous. It all seems like we're on a slipery-slope when we try to protect people's feelings and self-esteem. Remember: it's not the obvious cases that are going to be the undoing of us all: it will be the enlargement of definitions to include the smallest of slights.