I think the attendant just screwed up.
Yea, Oregon is one of only two states where you can't pump your own (except diesel) and I'm very happy about that. Our fuel prices are very near those states around us that 'claim' they have cheaper fuel. Just not true. And we have thousands of people employed doing it too.
I often see people fighting to fuel their cars in bad weather too often spilling. The attendants here are experienced, capable, and ready for the weather so that seldom happens.
The best part is that for nearly the same cost, I get someone who pumps my gas for me! HAH! And I can keep my clothes clean at the same time. And stay warm and dry inside my car.
Those who voted for self serve in Washington several years ago, for instance, saw the fuel prices drop for six weeks after the vote, and then they slowly crept up to OVER what we typically pay in Oregon. So much for savings when you pump your own.