Neurodivergent people tend to have a bit less of a social filter, they are more direct and honest, often to the point of bluntness (leading to the 'just say whatever' behavior you mentioned)
They also tend to be pretty unfiltered when it comes to their passions, and hyperfixate on them to the detriment of other areas of their life, like laundry.
And yes, these people are often excluded basically anywhere they go, and they have to mask their behaviours to appear more normal to get jobs. In that respect, the All Birds culture has absolutely pushed them aside, or pushed them under.
This is just my 2 cents, attempting to put some definitions around the All Birds and Nerd Nerds groups you described. I could be entirely mistaken.