If I may read a little into Hurst (apologies if I misread), I think the point is that high school doesn't always equal bad habits and club doesn't always equal good habits. You can't just automatically assume that the quality of one is going to be better or worse than the quality of the other just by category alone. (Well, you CAN assume that, but you know how that word "assume" breaks down...) There are varying levels of high school programs and coaches just like there are varying levels of club programs and coaches; I think the argument is against stereotyping, not whether or not bad habits can be picked up one place or another.
