My Therapist recently said my description of a once-friend of mine sounded like he had a lot of aspergers type traits. I think she said this to help better understand the situation and to validate what I was feeling. Also I think putting a label on things sometimes makes it easier for us to comprehend. She definitely was not diagnosing this person, and the information was meant for me alone to help me move on and learn.

I don't know what who described your parents this way but perhaps they were bringing attention to the fact that your parents were acting abnormally and the situation wasn't completely normal?

Also not to nitpick here but having traits of personality disorders doesn't mean they do have those disorders, but it does bring attention to the fact they might or that they are acting abnormally.

Those are just my thoughts - I don't have family members who are definitely diagnosed with a PD, so I'm no help there.

Hope you find the answers you're looking for