It’s not an opinion. Opinions are likes and dislikes, and subjectives with no evidence. This isn’t one of those. There is a clear definition, and clear evidence that it meets the definition. It’s a fact.
No, that’s not true. It’s not true because that’s not how we use disability language. Neurotypicals do not act autistic, and they don’t act ret**ded. Some people do use words that way, because those words are slurs. Likewise, when you insult someone by likening their behaviour to disability by calling them a narcissist, that’s a slur.
pwNPD are, on average, better at magick than neurotypicals. I also generally respect most pwNPD for the trauma they’ve endured and survived. It’s a disability that leads to a lot of suicidality, so being a living pwNPD is an accomplishment.
All disabilities are seen as negative, but it’s not derogatory to call someone autistic, paraplegic, or blind, unless it’s a deliberate insult. I find your argument unconvincing.
Narcissist is a slur when it’s used in a derogatory sense by someone who does not have the disability. You can say “person with NPD”, or pwNPD for short, or you can avoid insulting someone by alleging mental disability in the first place.