Embracing diversity and practicing tolerance had been mainstays of Joshua Vannoy's Pittsburgh-area high school ethnicity class - until the student wore his Denver Broncos jersey to school. A die-hard Steelers fan and teacher at Beaver Falls High School made Vannoy, 17, take a midterm test on the floor because he was sporting a John Elway No. 7 jersey. The honors ethnic relations teacher had Vannoy sit in a circle of desks, then instructed his classmates to throw paper at him. The treatment wasn't part of any classroom lesson, his teacher says. He had warned students before not to wear another...