Matthew, you may think that sort of review should not be posted in a book review section for ANY author...and I agree. And if it was a legitimate book review section of a newspaper or magazine or even a serious literary website, it wouldn't have been. At best, it would have made the letters to the editor section, if at all.
But, sorry, Amazon is not a literary review site, it is a marketing site that sells books. And review section is not really a literary review section, but frankly, it is a letters to the editor/op-ed page...where any nitpick is allowed to express his view...however ignorant, however dumb, however malicious.
I'm sure there are even far worse reviews and far less intelligible ones on Amazon. It's absurd to think that Amazon has the resources or even interest to scourge all the idiot, crap reviews of the hundreds of thousands or millions there most be for all the books they sell.
So you're just going to have to consider the source and save your offended sensibility for something a bit more earth-shatering than someone who doesn't have the basic skills to do a proper review.