Ever since it was confirmed that Gillian Anderson was going to star in a movie with Hannah Einbinder, she's been having fun on social media with a playful 'feud' with Einbinder's Hacks co-star Jean Smart. "Couldn't let Jean Smart have all the fun," Anderson wrote when the casting was announced, but the best was saved for the Cannes premiere of Teenage Sex and Death at Camp Miasma.