The Columbia University student targeted by a mattress-carrying protester filed a lawsuit Thursday against the school, arguing that it failed to shield him from harassment even though police and campus authorities refused to pursue rape charges against him. In a lawsuit filed in Manhattan federal court, Jean-Paul Nungesser said the school engaged in gender bias by allowing him to be subjected to a hostile and intimidating learning environment. The hostile environment was created, the lawsuit says, by the ongoing protest of fellow student Emma Sulkowicz, also known as the “mattress girl.”