Labeling black-and-white thinking as a purely autistic trait is quite funny to me because it implies that neurotypicals are somehow more nuanced.
Exactly. Regarding the tendency to think purely in a "black and white" sense as being some exclusive characteristic trait for autistic people is laughable. A lack of nuance is in fact dominant today.
People who end up in these communities, neurodivergent or otherwise, do so because, on a profound level, at least one psychological and/or physical need isn't being fulfilled in their lives. The dread intensifies, and overwhelmed, the insecurity they feel when they look in the mirror, juxtaposed with the endless array of beautiful, joyous faces that are plastered on social media and propagated through popular culture, creates a pure, simple recipe to latch onto and by which to absolve themselves of responsibility.
The mental health concerns of today are complex and, in certain cases, unprecedentedly so. The advent of easy solutions, of fantasies to yearn for based singularly on images, is deeply attractive therefore and they even perhaps contain an addictive quality.
But there are no easy fixes. To an extent, everyone is hamstrung in some way by their genetic predispositions. You just have to be grateful for and honest about what you have and work towards maximizing your potential. You have to be courageous enough to transcend the comfortability of victimhood, and take control. And to a certain extent, pain builds character, so you ought to be grateful for the difficulty that life has presented to you. Be proactive; put yourself out there. Fight for yourself.