Feminists come in all shapes and sizes. JC Lee’s Relevance, an MCC production at the Lucille Lortel Theater, presents a clash between a seasoned author and old school academic, Theresa (the formidable Jayne Houdyshell), and a freshly minted writer Mesmaji (Pascale Armand), given to texts, tweets, and social media. Age and looks aside, these two spar on a panel moderated by the ambitious and opportunist Kelly (Molly Camp), Theresa must have been something in her day. In a hotel room with her agent (Richard Masur) we learn of a long ago affair, but now she’s hit a time when all attention is on the new improved version: smart, sexy and African-American. But shouldn’t feminists be on the same side, fighting against economic inequity and gender harassment? In Relevance, the old and the new do not even speak the same language.