The point is that a disproportional number of foreign athletes have benefited from training in the US versus US athletes training abroad. There's no reason to be defensive about it. The US just has lots of advantages when it comes to training athletes. Foreign rowers, basketball players, track and field athletes, and plenty more come here and go to US universities and benefit from high level NCAA competitive training. They can still go back home and represent their country and win, and the fact that they trained in the US doesn't take anything away from their skill, dedication, and national pride.