Has nothing to do with it. Disney Parks present themselves as a "performance" or a "theatrical presentation," if you will. That's why every worker is called a "cast member." Every Disney park worker plays a critical role in the storytelling throughout the parks. In a sense, they are all a character. And when they are cast, there is a strict costume guideline for them. That includes hair style, facial hair, ect. It is no different than performing onstage. You are performing a role.
If you don't want to perform a role "onstage," then go work for Universal, Six Flags, Busch Gardens, or Sea World. Over there, you can be yourself. But at Disney, you are essentially playing character. If you're an attractions cast member on Pirates of the Caribbean (which is where I was), you don't have a generic outfit. You have a pirate outfit with a vest, knickers, a hat... Disney is your director. You are the actor. The actor performs a character. Actors in plays whether it be broadway or community theatre must abide by a costume/hair/makeup guideline. The same goes for Disney cast members. It's all part of the storytelling.