ADHD is a "disorder" that is predicated on "this person's behavior annoys people around him and therefore should be corrected."

ADHD is only a disorder because human pegs must be pounded into the square holes of class in a sterile schoolroom behind bars, during daylight hours for much of the year, in preparation for white-collar office jobs that many of them won't achieve, but nevertheless you must sit down, pay attention to lectures and study irrelevant things.

And if you can't pay attention, don't take away their computers, video games, or reduce their screen time, just pump them full of amphetamines until they're so drowsy during the day they're just struggling to fall asleep.

ADHD is very Harrison Bergeron, and the schizophrenic Vonnegut knew exactly what he was writing about.