I know this is an older thread but I wanted to offer my perspective. I have seen the stigmatism that comes with mental disorders. Anything different or not understood is generally thought of as "wrong" or "weird". I am not trying to be blindly optimistic but I think that the people who use such phrases are often either under/mis-informed.

In response to it being a true disorder, ADHD very much is a disorder in my opinion. While I prefer to think of it as a "difference", it can greatly impair one's ability to function. As for medication, my experience with ADHD medication has lead me to believe that it helps me show the positive qualities that I would like people to see. It doesn't take away anything. I'm still me- just a toned down version.