No surprise here. This is basic stuff, especially in that profession. If employees and outside contractors working in the stadium were allowed to pester athletes for pictures and autographs, they would never be able to move freely within their work environment. Its one thing to have to deal with the fans, but when you have to worry about the hundreds of people working the game stopping you, its stressful.
This reminds me of an incident that happened in 2000 during the Subway Series between the Yankees and the Mets. A cop that was as Shea Stadium went to take a piss break. Somehow, he managed to cross paths with Mike Piazza and asked him for his autograph. He got the autograph, only to have Piazza go and complain about it to the Mets front office, and in turn they called the Police Department and got the cop in trouble.
That was a bytch move on Piazza's part. If he felt that strongly about the situation, he shouldn't have given him an autograph.