Why does pony have a problem with johnny's idea to disguise themselves?

Johnny's disguise idea because he doesn't want to cut his hair that he took so long to grow and that it symbolizes that he is a greaser. What does Pony mean when he says, "I was supposed to be the deep one"

He means that Johnny could get more meaning out of some of the stuff in there than he could.

Explanation:

hey my good buddy lemme ask are u male or female? ?

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.