It’s nothing personal, says Ben Ewen-Campen, he just doesn’t think French impressionist Pierre-Auguste Renoir is much of a painter. Monday, the Harvard postdoc joined some like-minded aesthetes for a playful protest outside the Museum of Fine Arts. The rally, which mostly bewildered passersby, was organized by Max Geller, creator of the Instagram account Renoir Sucks at Painting, who wants the MFA to take its Renoirs off the walls and replace them with something better.