[kube-system]

That claim was a child comment to a specific usage of the word, which contained the context necessary for that commenter to come to that conclusion.

[fastball]

The context being the video in that linked article? Certainly wasn't enough context for me to make such a determination. I have no idea if she was using that word to talk about black people in general, her black friends, her white friends, herself, or something else entirely. Much less if it was being used in a derogatory manner.

[kube-system]

That, objectively, is enough context to determine the usage given the usage notes for that word in both Websters and OSX built-in dictionaries.

[fastball]

I'm not sure I follow? Are you saying the context here is that she is white and that is therefore enough for it to automatically be derogatory racist usage? That sounds... racist.

[kube-system]

That's a question that is sociological in nature, and far beyond the scope of the well-defined linguistic meaning of the word, which was what I was commenting on.