Perhaps the most immediately evident trait of patients with Narcissistic Personality Disorder (NPD) is their vulnerability to criticism and disagreement. Subject to negative input, real or imagined, even to a mild rebuke, a constructive suggestion, or an offer to help, they feel injured, humiliated and empty and they react with disdain (devaluation), rage, and defiance. (From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)
