"The point of that part of the CoC is that all environments do not have to be welcome to all, specifically that environments that are safe spaces for a marginalized group do not have to also be a safe space for the dominant group."
Now we're getting somewhere. So you've explicitly stated that Github should not be a "safe space" for the "dominant group," presumably white, male, et cetera. At least we've got that out in the open for the next time someone insists that these codes of conduct are simply about having a friendly and welcoming environment and aren't going to enable discrimination or harassment.
I don't think that part of the CoC makes harassment OK.
Furthermore, there's this part:
> "We will not tolerate discrimination based on any of the protected characteristics above [which includes race], including participants with disabilities."
I don't know how that maps to participation on GitHub. I will say that as a cis white man I am absolutely OK if a marginalized group wants to exclude me for their own comfort or safety. This can already be done just by using private repositories, for example, and I don't think it's controversial.
For public repositories I'm not sure what discrimination looks like. Certainly before this CoC no one had the right to force someone else to accept a pull request, right? The CoC makes it explicit that if you complain that you're excluded because of reverse racism your complaint will not be acted upon, though, which I don't see an issue with. It's a way to protect marginalized groups from spurious complaints by a dominant group.
If anyone who feels unsafe if they can't exclude some group is able to make a private repository, today, and you can't even picture what discrimination looks like on Github other than that... then what specific problem is it that we're actually solving here with this CoC? Sounds like an incredibly safe space for everyone already.
Now we're getting somewhere. So you've explicitly stated that Github should not be a "safe space" for the "dominant group," presumably white, male, et cetera. At least we've got that out in the open for the next time someone insists that these codes of conduct are simply about having a friendly and welcoming environment and aren't going to enable discrimination or harassment.