Does MO have a stand on neurodiversity, if even informal? If not, should it have a stand? And practically speaking, how might it have a stand that could improve the community as a whole?
As mentioned, the forum itself does not have a stand, as it is a database. Also, on many issues, the community is quite divided. On the basic issue of neurodiversity, I suspect many members have not considered it in the context of MathOverflow.
On the issue of behaviour, matters are quite different. While "be nice" covers some ground, more subtle issues are at work. In particular, the behaviour of many high reputation users (JDH, David Speyer, J. O'Rourke, T. Tao, R. Bryant, to name a few) are examples to be modeled, and the balance between personal expression and quality content for the forum should always be considered. If you weight heavily toward the former, the community will not support you. As a rule of thumb, pretend you are at a seminar with the whole world watching.
(For personal reasons, I do not hold myself to the same standard as the esteemed list above. I am always conscious of the public nature of my contributions though, and try to provide a certain kind of nonprofessional quality, as I want to make some mathematics more accessible.)
It appears to me that you are upset. I don't know that I can offer any help, but you may find my email address on my user page. Write to me or to the moderators if you have an issue behind the one in this post that you believe merits discussion.
Gerhard "We're Here To Help Many" Paseman, 2020.01.26.