I’m very disappointed in poem_for_your_sprog for almost understanding this point, and then immediately making the same mistake she was calling out
‘I have to sort my books!’ she cried,
With self-indulgent glee;
With senseless,narcissisticpride:
‘I’m just so OCD!’
‘How random, guys!’ I smiled and said,
Then left without a peep -
And washed my hands until they bled,
And cried myself to sleep.

This is the opposite of true. The adjective “narcissistic” has been in common usage since the late 19th century to mean the exact same thing it means today, i.e. “self-centered.” The term “Narcissistic Personality Disorder” wasn’t coined until 1968.
Truly, you’re eager to manufacture outrage for some benign things. What’s up with that
“In common use in the 19th century” is a liberal interpretation of Havelock Ellis coining the phrase “Narcissus-like” in 1898. Sure, that’s the 19th century for two more years, but the actual word “narcissism” doesn’t appear until 1911, and it’s clearly within a psychiatric context.