Here’s a scene from Candide where two philosophers are discussing the joys of Pococuranté, a miserable critic:

“But don’t you see,” answered Martin, “that he dislikes everything he possesses? Plato said a long time ago that the best stomachs are not those which refuse all food.” “True,” said Candide, “but still there must certainly be a pleasure in criticising everything, and in seeing faults where others think they see beauties.” “That is,” replied Martin, “there is a pleasure in having no pleasure.”