I know what his instruction forte is. And that is exactly my point. If you are targeting professionals, why attack a group that is predominantly hobbyists?
If you're talking about the hobbyists on AR15.com, it's probably because they try to pass themselves off as professionals, jump on anyone's back that has different opinions or gear from the majority of the elite, and just generally act like, well, a bunch of douches. Maybe he was fighting fire with fire, in the only way that most of those people will understand.
Seems to have affected a few here too.