In order for a person to be diagnosed with narcissistic personality disorder (NPD) they must meet five or more of the following symptoms:
Has a sense of entitlement, i.e., unreasonable expectations of especially favorable treatment or automatic compliance with his or her expectations
Is interpersonally exploitative, i.e., takes advantage of others to achieve his or her own ends
Lacks empathy: is unwilling to recognize or identify with the feelings and needs of others
Is often envious of others or believes that others are envious of him or her
Shows arrogant, haughty behaviors or attitudes.
well, that makes five
He doesn't need to give any type of reason at all. Making a blog post about how you find that funny or stupid of him isn't helping anyone. Does that mean he wasn't being a jerk with those comments he made? I'd say he pretty much was.
Maybe some day Silkwizard will take the high road.