Let me break this down for you fundamentally:
One of tech.lgbt's mods made a post telling people to be cautious of TheBadSpace after it wrongly caught tens of thousands of LGBTQ+ people in its blocklist.
The masto.art admin asserts, absent ANY proof, that this mod both knew that a black man was running the blocklist AND intended to stir up a flurry of racist abuse against this man. This has led her and others to lash out against the whole instance, saying unbelievable things like they're "as bad as KiwiFarms", and defederating from them completely.
The tech.lgbt admins dug into this, produced a huge write-up explaining every step of what happened, and in the end concluded that no, their mod's post was not the catalyst behind everyone getting upset about TheBadSpace, nor did their mod realize what a fucking minefield they had stepped into.
The masto.art curator looked at this long post, rejected it outright, and just called them racist some more.