There is a lot of ignorance in that thread though. This is one of those subjects where you should be very careful about who you listen to, given all the disinformation floating around on the internet.
Honestly, the ignorance and arrogance regarding audio and its playback is one of the distasteful things about the audio engineering/audiophile community. Even in a room full of engineers, you will still get people arguing to the death about things outside of human perception (My family, full of electrical engineers is unfortunately filled with this type). For whatever reason, the idea that their ears may be just as limited to the audio spectrum as their eyes are to light spectrum is a concepts just too foreign to grasp.
You have places like gearslutz, which is, as far as I know (though I haven't been there in a long time), the biggest audio engineering forum out there. The community, as a whole seems to disagree with the very concept of an AB, or ABX test. I mean, it's approached flat-out superstition.
The thread that finally made me through up my hands and leave the place was when a big post erupted after a very well respected member of the community had the gal to suggest that microphones were not filled with magic, and thus limited to physical properties. It devolved into personal attacks against the guy, and his education, and people asserting that "science can't measure what I'm hearing."
http://news.ycombinator.com/item?id=3668310