A large number of people claiming to have ADHD are just using it as an excuse for lacking any self-discipline
This is no way disregards the difficulty of living with an actually severe case of ADHD but is not what most of these people are dealing with.
EDIT: many seem to have misunderstood what I mean by this. I'm not saying these people are only claiming to have ADHD to use it as an excuse. What I mean, is that they may very well do have, and they're using it as an excuse. Mostly to themselves.
How is this not the mental health version of racism?
OP walks by black homeless person. "They might be black, but they are using their race as an excuse to be lazy. They are only getting in their own way"
OP walks by a disheveled person with ADHD. "They might have ADHD, but they are using it as an excuse to be a mess. They are only getting in their own way"
While I do agree (or at least hope) that we all have the agency to positively influence our own lives and those around us, the main point there in my opinion is that different people have different resources in life.
Someone that's experienced systemic racism, or someone who's brain is a wee bit non-standard just has it harder than someone not experiencing these issues.
I never claimed some people don't have it harder than others. It's a spectrum and a large number of people are not in the far end of it. Those are the people I'm talking about. Would it be easier if they didn't have this condition? Ofcourse it would. That however still doesn't mean that personal agency doesn't have a role in it. There are several reasons for why people struggle with getting things done and in the vast majority of cases having ADHD is just one of the contributing factors. It's an explanation, not an excuse.