We have decided some brain quirks are disorders (and get accommodations, as is compassionate), whilst others are flaws (and get slurs). But no one picks their hardware. You cannot earn a better prefrontal cortex or deserve a calmer amygdala. Nor does one get to pick the environment they are born in, which will inform their choices later in life. Even the capacity to “learn better” is a roll of the dice, some brains start the race with sprinting shoes, others with lead weights.
So when we call someone stupid, lazy or insane we are not describing a choice, but simply announcing which kinds of unlucky we’ve decided are worthy of scorn.
Sry, but afaik there are some flaws with this hypothesis. Neurodivergence is no defined Illness but a catch-all-term for deviations from the norm. The thing with normality is, nobody really wants to be a normalo, and only very little people fit there. Everyone has his deviations. Neurodivergence refers to mental deviations from the (statistical) norm.
Whether you Like it or not, Person A with schizophrenia and Person B with depression only have in common that they both suffer from a ICD-defined Illness. That aside, theres not much in common between the two.
Calling the ability to be mentally ill, a defining trait of humanity is kind of strange. That would make normal people less human?