Yeah, people often use medical terms to describe ordinary states of being. A medical term is warranted only if the condition is ongoing and seriously interferes with one's life.
One of my pet peeves is saying "paranoid" when they mean "anxious" or "wary." Paranoia -- or, more accurately, paranoid schizophrenia -- is a rare and serious mental disorder characterized by hallucinations and delusions of grandeur and persecution. It doesn't mean making sure your door is locked at night, or being wary of your neighbors because they act like lowlife. It means wanting to kill your neighbors because you sincerely believe that you're exiled royalty and they are spies from a hostile foreign country, surveilling you and reading your mind and beaming orders into your head.
Likewise, OCD doesn't mean you like to keep your house neat. It means you have intrusive thoughts that make you wonder if you're possessed by the devil, and routines that you must carry out to the letter or something awful will happen. Sometimes these routines involve self-harm but you feel you have no choice. Being autistic doesn't mean you enjoy your hobbies, it means your brain is wired so differently from most people's that you experience serious difficulty with everyday tasks that most people take for granted.
Words have meanings, so hyperbole annoys me in other areas as well. For example, when one of my students complains that a math question "took forever," I have to bite my tongue from saying, "No, it didn't take forever. Actually, it took about 5 minutes. When the sun runs out of juice 5 billion years from now you won't still be working on it."
When someone says everyone is a little bit autistic I want to say: You can drive, I can't. You can have a fluent conversation, I can't. You don't feel like a truck ran over you when someone shouts, I do. And you can take care of your own ADL's while many autistic folks need help with basic tasks like eating and going to the restroom.
The problem isn't self-diagnosis. Autistic people sometimes rely on self-diagnosis because health care in the USA is so hard to get. The autistic community generally recognizes and respects this. As with any other community, we know our own. The problem is making hyperbole of medical terms, thus trivializing the suffering of those who actually do have such conditions.
