Great Story.
It's usually unwise to argue a case with any enforcement person in the field. Its sort of like doing mental combat with an unarmed person.
I guess the reason I'm responding is this. WDFW staff is apparently pretty frustrated over being unable to do much with poachers, commercial netting, tribal fishing and the like. Probably they'd had a tough day somewhere else, and were looking for an easy pinch to make up for lost time elsewhere.
Sport fishermen are going to experience a lot more of this type of stop, because we're easier targets.