Believe me, that will make most bullies even more angry. They'll feel more insecure because now they're inferior to the "shrimp" in a way. It's just adding fuel to the fire.
I attended 8 schools between ages 12 and 18 (yes, more than one per year) and was bullied throughout.
And that's why comparing parenting strategies is almost never fruitful -- nearly every decision a parent makes is deeply personal, made with very few data points.
( By the way, if any parents here have NOT read Nurture Shock, buy it right now. Pretty much the only data-driven book on parenting there is. http://www.amazon.com/dp/0446504122 )