Yes, it is true that new ideas need criticism. However, if one is almost always critical of new ideas, especially ones that push beyond your wheelhouse, then that is a problem because you'll never innovate. PG lumps it with haters and trolls because that's what being a negative person entails. The point is the extremity. There is nothing wrong with being a hater, proportionately, as you can only love something if you hate its opposite.