All of this is your subjective connotations.

For example, there are many types of disease and not all of them are communicable (eg. kidney disease).

ADHD - diet, sleep and excercise are considered a treatment or at least beneficial for some diseases (eg. Diabetes). So this is also a poor argument.

Disease diagnosis is not about "separating groups of humans with one having the advantage". It is about understanding what kind of support they need.

I don't see where the word "disease" causes any more harm than "disorder".

Assholes are going to asshole, regardless if the medical term used.