If you're using Form 5129 (crew dec.) and you were not part of a working or deadheading inbound crew it's a problem. If not, all the guy has to say is "you're in the wrong line".
+1 for global entry.
From the IATA site, US CBP notes:
Crew members customs regulations::
Crew are allowed to import:
a. one open litre of alcoholic beverage; and
b. 300 cigarettes or 50 cigars or 2 kilograms of smoking tobacco, or a proportionate amount of each; and
c. merchandise not exceeding USD 200.- in value, which may include gifts the crew member has purchased for persons in the United States, free of duty.
A special crew line is available.
Because the crew line is referenced in regulations, and you weren't a crewmember, they're probably within their authority to be dilweeds.