Let me see... how to describe in an empathetic and sensitive way how all this erupted.
For people wondering what this is about, this discussion began about a week or more ago, when an autistic person on mastodon (who said they were going through meltdowns online due to trauma and who was lashing out because of this), made a series critical posts and comments about "late diagnosed autistics" who were allegedly acting "superior" to "early diagnosed" (in terms of age), as if they were a dominating autistic spaces online.
It was much like accusing late diagnosed as acting similar to what some autistics say about "aspie supremacy" autistics. It was suggested or implied in the discussion that "early diagnosed" (in childhood) were more autistic or more representative of autistics than the late diagnosed who were said to dominate the tag.
It came up in these discussions that some of the "late diagnosed" are also self-diagnosed, and the discussion included some misconceptions about the purpose of the #actuallyautistic tag and whether it was inclusive of self-identified/self-assessed autistics. If I recall correctly there were also criticisms of autistic "identity" as a concept.
So just as a public service announcement I posted this on my own timeline: