It's like height. Everyone has a height, but if you're 180cm tall you'll find the world caters to you well, but at 250cm you struggle to fit and basic tasks are difficult.
Having both OCD and ADHD I can tell you that people who say they are "a bit OCD" or "a bit ADHD" have never wished they were dead because their executive function is shot and their emotional regulation is so compromised, and that they're fed up of washing their hands until they bleed.
Everyone has some traits of most disorders from time to time. What marks a disorder is that it is constant, unrelenting, pathological and happiness destroying.
I read it as, "everyone experiences the symptoms of ADHD to some extent, including those who don't experience symptoms beyond the threshold of a disorder."
The big question is, do you see that fact as a tool for the average person to trivialize or to empathize with the ADHD experience?