Discuss the importance of refuting actual facts presented by someone and criticize the tendency to attack the messenger instead.
It is important to shoot the messenger.  That way our ignorance can continue.  Refute her facts if you can.  I know it is hard for many of these commenters to get off their righteous indignation high horses but try anyways, you might learn something.  Or you can keep shooting the messenger and make more inane comments.