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water off a duck's back

be (like) water off a duck's back !
If criticism is water off a duck's back to someone, it has no effect on them at all

Examples:
He's always being told he's lazy and incompetent, but it's just water off a duck's back to him.
I've told him that he's heading for trouble, but he doesn't listen - it's just water off a duck's back.

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