Camilla Luddington clapped back after one Grey’s Anatomy fan took aim at the show for using KN95 masks on set amid the coronavirus pandemic.The long-running ABC series kicked off its 17th season on November 12, and while many fans were thrilled to see the familiar faces of Seattle Grace Mercy West Hospital again, one viewer thought the cast was “wasting” personal protective equipment that could be given to first responders in need amid nationwide shortages.