Disney wrote their cast members, informing them about the new policy: “We strive to provide a great experience for the entire family, and unfortunately selfie sticks have become a growing safety concern for both our guests and cast. The use of selfie-sticks also compromises our ability to deliver on The Four Keys Basics: Safety, Courtesy, Show and Efficiency.”
Finally. This has been becoming a real problem. All people have a certain concept of personal space, and the selfie-sticks violate that. Think of the attractions, with a self-stick you could inflict a lot of damage to the attraction and to others around you. While I wouldn’t want to be a Cast Member explaining this policy, I am happy they are taking a hardline on this.
Source: The Disney Blog