This is from The House At Pooh Corner by A. A. Milne:
Then, suddenly again, Christopher Robin, who was Still looking at the world with his chin in his hands, called out
"Yes?" said Pooh.
"When I'm--when-- Pooh!"
"Yes, Christopher Robin?"
"I'm not going to do Nothing any more."
"Well, not so much. They don't let you."
Pooh waited for him to go on, but he was silent again.
What is the meaning of "They don't let you"? I think that "They don't let me (do nothing)" would make sense. Who is "you"? Pooh? What is the word after "let you"?