That is a fantastic waste of everyone's time: both for the customer who has to transcribe a problem according to the whims of an online community and to the volunteers who may or may not actually be able to help.
Kun misquoted my review, stating "As the Amazon reviewer 'SCB' put it, 'the book feels more like a refresher than an introduction.' User 'zach' concurred, calling it 'not a kind introduction'..." In fact, I am not qualified to describe the book as a refresher, because I have no background to be refreshed.
Moving on, it's disappointing that Kun didn't see any value in improving his product based on common feedback. It seems like negative reviews would be an opportunity for the author to better understand the audience he marketed his book toward.
At the same time, it's disorienting to see a real person acknowledge one of my reviews. I'm sure if I knew Kun in person I would be far more appreciative and impressed with his dedication and work than I allowed myself to be as a paying customer. I want to thank him for taking the high road and not lashing out at me for the unproductive snark that peppered my review.