Does "shut up and hack" apply to telling them to keep their racism to themselves?
(I realize you didn't say anything about racism, but you replied supportively to a comment about it, so I'm not sure where you stand.)
If that's really true, doesn't "shut up and hack" apply all the more? If you really cared about the code, you could keep your political opinions to yourself.
(Also, this is precisely why many codes of conduct define the exact harms they care about - so racism is an excluded harm, but, say, making Hans Reiser feel bad about being a murderer isn't. If you're a fan of racism, you might use this as an indicator to avoid the project and find another one, or fork it under the license.)
However on forking I do tend to agree. There appears to be an audience for projects with less controlling, or less ideologically intended rules. These projects should be formed and developers should make their own choice between them.