I have yet to see significant sexism/racism in open source, but I have seen an insurmountable amount of drama, bad behavior, prosecution and prejudice from people proclaiming to fight against it.
I believe it. I don't think it is a significant problem in OSS that we suddenly need behavior rules but there can still be instances of something like that occurring. The most convincing action was to not release details in my opinion.
What if accusation is proven (and this person agrees with it) but said person does eir work really good. Should ey be forcefully removed from this position? What if there is no good replacement candidate at this time?
Your PS seems conceited to me. Singular "they" is how the community of English-speakers handles this; it harks back to at least Shakespeare. It's miles more "correct" than any weird neologisms.