From a purely aesthetic view, the sublime contrast of white on black conjures philosophical notions of diametric opposites waging an eternal struggle for the attention of the observer or, as in this case, the reader. On the other hand, the conditioning of the human mind to peruse black typeface on a white or near-white background is as ingrained in us as our sleep cycle. Therefore, when the color priorities are reversed it causes an innate and even subconscious discomfort that can affect our comprehension of the text set forth. It then becomes extremely difficult for one to discern the nuances of the typographical, not to mention grammatical, errors of the author of the brief and erroneous essay in question.
"Reality is merely an illusion, albeit a very persistent one." ~ Albert Einstein