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What the hell do you know about surfing? You’re from goddamned New Jersey.
— Kilgore ‧ Apocalypse Now

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker dismisses another person's knowledge of surfing by pointing to their New Jersey origin. Place of origin is treated as enough to discredit expertise. The aggressive question exposes that assumption without demonstrating what the person actually knows or whether the geographical objection makes sense.
Context reviewed