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What inference is Stanley making about Blanche when he says "You won't pick up nothing here you ain't heard before"?
Stanley believes Blanche is cultured and knows all the slang of New Orleans.
Stanley infers Blanche's class has similar slang.
Stanley is aware of Blanche's illusions and does not believe her prim and proper act.
Stanley is simply trying to insult Blanche as she insulted him in the last scene.
Stanley suggests that Blanche knows more than she is saying.