Earlier quoted context omitted.
You know that `man' used to be gender neutral? ( https://en.wikipedia.org/wiki/Man_(word) )
And "white man" is used here in the context of post-colonial Africa, where the phrase is loaded in a way that's relevant to the study.
Take up the White Man's burden, Send forth the best ye breed
Go bind your sons to exile, to serve your captives' need;
To wait in heavy harness, On fluttered folk and wild—
Your new-caught, sullen peoples, Half-devil and half-child.