The author of the book she reviewed complained to Amazon, got her review pulled down, and did a "revenge" review of her book in an attempt to tarnish her sales.
How fucking childish is that? I've heard of authors complaining to reviewers that they did not "read their book right" after receiving a less than stellar review. What the hell? How can you read a book wrong? If they misunderstand anything then it's your fault Mr-knickers-in-a-twist. Why don't you stop whinging and listen to what they have to say? You might learn something and improve as a writer.
I've struggled to accept bad reviews in the past. I've had some harsh ones. It is natural to want to defend your book. I've done it in the past. I'm not proud of it. I've never done it to a reviewer though. I've done it to people who have been kind enough to critique me. But I've learned from those lessons. I've been childish in the past. Easily hurt. Offended. I try to be more mature now. Now when people critique me on line I address all their points, good and bad, and attempt to see things through their eyes. And you know what? By swallowing my pride and listening to others I really feel like I have improved a lot as a writer.
Every writer must learn how to accept criticism. A bad review is not an attack on you or your writing. Do yourself a favor and stop reading reviews of your books all together if the temptation to respond to them is too strong for you. Be professional.