If you take time to read and comprehend, you will understand that the stadium policy stated that no sign could be hung. Hand held signs are allowed. Then you read further and understand that the sign holder asked for permission first, and that the sign was being held. It was not hung. Even the picture supports this.
Therefore, I would say Cam was in the wrong and is indeed a douchebag. I would expect the team to make this right. Not to the tune of 5 bills though, which is a ridiculous price to pay for something so simple.