Heeeeeeeere's Johnny! Keats!

No one hates an author more than another author, particularly if they are authors in the same time period. (Fenimore Cooper's Literary Offenses come to mind), but few can be as sneering in prose as Lord Byron:

Lord Byron on John Keats (1820)

“Here are Johnny Keats’ piss-a-bed poetry, and three novels by God knows whom… No more Keats, I entreat: flay him alive; if some of you don’t I must skin him myself: there is no bearing the drivelling idiotism of the Mankin.”