Jews don't play contact sports.
Like the Asian stereotype, Jews have long been cast as white collar professionals. They're accountants, executives, and business people—not tough and tumble athletes. There's no way their overprotective, coddling mothers would ever let them strap on a football helmet. This stereotype is fueled by the greatness of three great Jewish athletes in particular: baseball's Sandy Koufax and Hank Greenberg, and swimming's Mark Spitz.
The three greatest Jewish athletes ever just happen to play non-contact sports, and the sport with the largest professional Jewish population is baseball. For some, that's no coincidence. But let's not disregard the likes of former welterweight champion Yuri Foreman or Samuel Berger, the world's first Olympic boxing champion, or former All-American Duke guard Jon Scheyer, Hall of Fame tackle Ron Mix, and Hall of Fame quarterback Benny Friedman.