>because (apparently) this style of parenting is common.
It is not common. Every Chinese mother I know (that would be quite a few) found the Amy Chua article to be repulsive. Just like the American moms did, except that they knew people would equate them with Chua's ideas so it makes them even angrier. My own wife (a Chinese mom) and her friends and relatives have been circulating the Chua article and talking about it and the consensus is a universal "WTF is wrong with this woman?!"
Then you read that the Wall Street Journal article was, at least to a certain extent, not representative of the actual tone of the book and you realize that this piece, so disliked by real Chinese mothers is an exaggeration of the whole phenomenon.
People like the mom in this linked article are responding to an exaggeration of a caricature (and should be aware of this, though, from their own defensive and annoyed tone I suspect are not) and it strikes a chord because people are too sensitive to perceived criticism of things that matter deeply to their psyches... like the job they do raising their kids.
So the WSJ takes an extreme point of view, exaggerates it to fit a caricature of a certain racial stereotype, people get annoyed at this mostly made up thing and start reacting angrily and the WSJ and those involved in the book make money off of the whole mess. Shameful.