"Is it useful at all to confront the NPD person....."

"....to protect themselves from rejection,humiliation,and criticism they often react with disdain,rage and defiance at any slight criticism...." 4th paragraph ~theories heading N.P.D wikipedia.~

"....may manifest wishes to be feared and to be notorious...."

There are various sub-types in regard to NPD,so this is just an add for a possible result to confrontation.
Further....under the search title (so,a different search) "Narcissistic rage and narcissistic injury" (entered into wikipedia)......lower on that page,..."self psychology and narcissistic rage" [bold letters]...."the need for revenge,for righting a wrong,for undoing a hurt by whatever means....is related to their need for total control of their environment.It is a need to turn from passive victimization to an active role in giving pain to others.....in an attempt to rebuild their sense of self-worth...."

I personally would not follow my desire (and it'd be a strong desire) to confront or debate....they are excellent at debate,and cutting you 'down to size".It'd be pointless really.

I also want to say that as with borderline personality disorder (which I have,and let me tell you it does 'suck',I abhor it),the NPD really did not receive appropriate parenting to assist them in developing to a healthy balanced personality.It develops out of a very flawed parenting experience.I think,to a degree,they are deserving of some level of empathy,though not the sort that encourages ongoing interactive episodes of intellectual debate,(unless they genuinely desire to work through things),or compensatory tolerance to an ongoing dysfunctional relationship,in which both parties are at risk of emotional abuse,simply because arguments/confrontations can become very heated.

Always take anything I say with a grain of salt.These are no more than a mixture of personal interpretations of my experience,some quotes,and personal opinion.A mixed bag really.~W~