Narcissists HATE happiness and joy and ebullience and vivaciousness and, in short, life itself.
The roots of this bizarre propensity can be traced to a few psychological dynamics which operate concurrently (it is very confusing to be a narcissist):
First, there is pathological envy.
The narcissist is constantly envious of other people: their successes, their property, their character, their education, their children, their ideas, the fact that they can feel, their good mood, their past, their future, their present, their spouses, their mistresses or lovers, their location…
Almost ANYTHING can be the trigger of a bout of biting, acidulous envy. But there is nothing which reminds narcissists of the totality of their envious experiences than happiness. They lash out at happy people out of their own deprivation.