as a black male living in a white majority country (thankfully, not the US)
I think the "thankfully" part can be safely edited out, to moderate stuff even further. 'Not the US' is certainly not very helpful to me, a more accurate culture/location would be better in my opinion, but it at least rules out some stuff. As far as I'm aware my home-country of The Netherlands are a majority white country, but there are still places (cities/areas) where this is not true.
Talking about racism and race issues with white people can be particularly emotionally draining and frustrating, because of the constant defensiveness, deflections, ignorance and "tonal" arguments.
I think (suspect?) this is the OP talking about their experiences. At least, that's how I interpret it: It's not meant as an absolute statement, it's what the OP experiences when they talk to white people, and what they apparently have never experienced talking to other demographics (there was a comment confirming this before stuff got cleaned up).
All in all, I think this is a case that the community can handle through editing, because we're, as a community, responsible for being nice.
Keep in mind that this may be a serious problem for the OP and that any attempt at toning it down may feel like you're forcing them to calm down, that their issue isn't that serious. That's especially hard if it's about a frustration where they were frequently told to calm down during those discussions (because that's what tonal arguments are).
If you feel a hint of people being afraid of being judged in their questions, don't start judging. Edit out the fears, and make them aware that on this site, it is imperative that edits, comments, and answers all stick to the premise of a question.
So, don't make your edit wit a message like 'calm down, no need to be rude'. Explain our Be Nice policy (link to it), how their words may be misinterpreted or lead to the amount of comment crap it led to. Write your edit message in a supportive way, mention that you'd like to see their question remain open and get some good answers on this site.
As far as I can see, after the request for online resources was edited out, all that remained was a good, but rather rudely phrased, question on how to set a boundary and assert that you're not going to talk about this stuff. Just edit it into a more neutral post (which was done for a large part already) and raise a flag, like explained by Catija if you feel this is behavior that needs to be tracked.
Sometimes edits do miss parts, and several edits are needed to get all of the wrong words out of a rude post. Like here, where one observant user noted several hours after I already corrected some of the language, that there were still a few words that slipped through the cracks. Don't be afraid to pile another edit onto it, if that's what's needed.
EDIT: as pointed out in the comments by the OP:
You wrote: "I think (suspect?) this is the OP talking about their experiences. At least, that's how I interpret it: It's not meant as an absolute statement, it's what the OP experiences when they talk to white people". No, you're wrong - it's not just me who is fed up of this. There is a book published on this very topic (I linked to it in my post).
It seems this particular sentence upset the OP, apparently, it's not only their experience, but there's reference material to back this up as well. I never intended to imply this was only their experience, and that there was no-one else experiencing the same thing. If there's literature to illustrate that this is a wider problem, by all means, feel free to include that as well. It's good to mention this: you read about the subject, and you've experienced this yourself. Either way, experiences and/or references are needed when making, what was before the edits, a blanket statement: a vague and noncommittal statement asserting a premise without providing evidence (such as specific numbers). If you can, and there are numbers in the book, please include those in a quote as well. Links on SE can get broken, it would be nice if the information remained.
Prompted by the comments, another late addition:
So, I do like your answer in general, but something has been nagging at me, and after some thought, I think it's that you have the general suggestion to edit (and how to describe the edit to the OP to make it go well) but didn't really say much about what kind of editing is and isn't okay. There was an extended edit war here, including forms of the question that removed significant details from the question, and trying to make a question "neutral" when it involves unpleasant experiences caused by others is tricky at best, so addressing that a bit more directly seems important.
It's hard to formulate guidelines that will fit every question, but for this specific question, these are my thoughts:
What happened in edits 9 and 10, although well intended, indeed removed significant details from the question, going so far as to even remove parts proving the OP did not only have negative experiences talking about race with white people. In hindsight, I personally would have rephrased the bits that were edited out, but would have left the facts that OP is aware that not every white person is bad and OP did lose friends/acquaintances due to these issues.
Only in the final few edits, people actively tried to edit out 'white people' and 'black people', and replace it with more generic things like 'majority' and 'non-majority'. I am personally not fond of this approach, because there's probably a certain power balance involved between black/white that may be different across races, also due to cultural/societal norms and expectations on the behavior of these kinds of people. I'm seeing them more as a description than a form of name-calling.
So, what kind of editing is or isn't okay in this case?
- Edits should not remove relevant personal experience entirely. Even if not phrased in an entirely optimal way, don't just delete it all. Never delete personal experience, unless it's completely irrelevant to the question.
- Edits should not remove details that provide stuff like information on cultural/societal norms, relevant background or power-balances (which black-white does). IPS has a history of always asking people about this, and we close questions that don't include it as too broad.