https://en.wikipedia.org/wiki/Pejorative

A pejorative word or phrase, slur, or derogatory term is a word or grammatical form expressing a negative or a disrespectful connotation, a low opinion, or a lack of respect toward someone or something.[1] It is also used to express criticism, hostility, or disregard.

https://www.merriam-webster.com/dictionary/slur

an insulting or disparaging remark or innuendo

https://dictionary.cambridge.org/dictionary/english/slur

a remark that criticizes someone and is likely to have a harmful effect on their reputation:
an offensive word used to insult someone because of their race, sexuality (= the fact of being sexually attracted to people of a particular gender), etc.:

https://www.dictionary.com/browse/slur

a disparaging remark or a slight:

The N word is specifically a slur referring to a mental disorder, and is thus an oppressive slur

https://en.wikipedia.org/wiki/Narcissistic_personality_disorder

Narcissistic personality disorder (NPD) is a mental disorder

https://www.mayoclinic.org/diseases-conditions/narcissistic-personality-disorder/symptoms-causes/syc-20366662

Narcissistic personality disorder is a mental health conditio

https://www.britannica.com/science/narcissism

Narcissism, pathological self-absorption, first identified as a mental disorder by the British essayist and physician Havelock Ellis in 1898.