Here's another installment of rationality quotes. The usual rules apply:
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It's not clear to me why you think this. Repeating it every time is tiresome, sure, and so that's why the assumptions should be implicitly stated rather than explicitly stated, unless explicitly stating them helps in that situation.
But the central claim is that "all data is theory-laden," which is an important point. It applies to what we perceive "directly" just as well as it applies to the chemical composition of photographs of distant galaxies (to use David Deutsch's example), and so I don't see how a Johnsonian objection would apply.
An important point, yes, but one which should not be reduced to an absurdity. If, while walking, I stub my toe on a rock, which assumptions and theory make this fact "theory-laden"?