In a blow to advocates of transgender rights, the U.S. Supreme Court Monday said it would not hear the case of a high school student fighting to use the bathroom of his choice. The court also wiped off the books a lower court ruling in favor of the student, Gavin Grimm, which had said federal law allowed him to use school restrooms matching his gender identity. ‘This is a detour, not the end of the road,’ said the ACLU’s Joshua Block, who represented Grimm.