I say this as someone with ADHD:
The issue is that ADHD is not real in the organic sense. Well, at least the evidence is scant. It's more of a description than a disorder. It's not something one "has."
I like to compare ADHD to racial categorization of people. Race is not real in a biological sense, but it's definitely real in a social sense.
I am probably butchering what I am trying to say so, just read this if you want to understand someone(s) that can communicate eloquently.