Firstly, let me say that I agree with the assessment of the author that sacrifice bunting is stupid, and the only thing stupider is the way it's scored. You get an out recorded against you for hitting a flyball to right field that can advance a runner to third, but you get a free pass for doing the same thing on a bunt. There is no logical explanation for it.

Second, I'm not sure that his analysis is completely correct about why power hitters don't bunt against the shift. I think it has more to do with the fact that they don't practice bunting, and aren't confident in their ability to lay one down and then run to the bag (as many--obviously not Josh Hamilton--are the slowest players on the team). But that brings up the point of why don't power hitters practice bunting. I have no idea, but I suspect they just don't consider it ever. However, both Papi and Prince Fielder have taken to learning to poke singles into left field in the last year or so, and it's showing up in their batting average (both players have above career batting averages the last three years).

I don't think that bunting against the shift would get a player as much ribbing as throwing free throws underhand, mainly because bunting is already part of baseball, while underhand free throws are almost exclusively thought of as something little kids do.

Anyway, the long and short of it is that bunting for a base hit = good (no matter who you are), and sac bunting sucks (no matter who you are).