I don't think it had anything to do with the code. She rewrote sed in JS, which IMO provoked the response (more here http://news.ycombinator.com/item?id=5107625).
https://github.com/grosser/pru https://github.com/colinta/ned https://github.com/aljungberg/pyle https://github.com/zzak/gsub https://github.com/bjfletcher/node-js-sed
I'm sure there are more. These are just a few I could find a few minutes.
Sorry, I'm not trying to call you out here. I just have serious doubts that the criticism has anything to do with merit. In other words, I don't think it makes sense to rationalize jerky behavior :(