Because Benoit is popular, so your disagreement with the norm makes people want to flame you. You also remind people of Dark Kane for ripping a very athletically talented technical wrestler. Even though you have a valid excuse (he's boring... and I can see where you might say that), most people will think that you suck anyway. Therefore, while you are free to say you hate him, everyone else is free to say they hate you for hating him, because most people love him.
There, I managed to be sarcastic and serious and provide a real reason at the same time.