It’s common.

women supposedly dating men with narcissistic personality disorders, when in reality these men might be just not nice people or might just not be interested in a woman. Doesn’t make them narcissists. I have a clean house, that doesn’t mean I have OCD. One is upset about an event, doesn’t mean they have depression. One has memory of a bad event, doesn’t mean they have PTSD etc People

I focus on peoples behaviors unless there is a reason for me to know diagnosis, then I rely on professional diagnosis