H/T Ann Althouse. The horrid Anton Chekov visited an ailing Tolstoy who asked him to bend his hear close and said:
"You know, I hate your plays. Shakespeare was a bad writer, and I consider your plays even worse than his."
If only someone had done the same for Ibsen.
I know what you're thinking: But Shakespeare was great? Sure, but consider the power of the insult. Suppose you wanted to really tear someone down but offer them nothing they could use to better themselves? That would be the way to put it.