Where The Wild Things Are author has told parents who think the film is too scary for their children should "go to hell".
The film adaptation of Maurice Sendak's classic book has been a box office smash in the US, but the success has been overshadowed because of some parents' reaction to the dark content.
But Sendak has revealed he will "not tolerate" their concerns.
Talking to Newsweek, he said, "I would tell them to go to hell. Do whatever you like. But it's not a question that can be answered."
The author also hit out at Disney bosses for sanitising his favourite childhood character Mickey Mouse as soon as he became popular.
"He did things to Minnie that were not nice. I think what happened was that he became so popular - this is my own theory - they gave his cruelty and his toughness to Donald Duck. And they made Mickey a fat nothing. He's too important for products. They want him to be placid and nice and adorable."