I'm a member of delta kappa epsilon. The "frat business" he was talking about was probably just the pledging and rituals that his chapter performed. In terms of talking about initiation, most fraternity members probably won't talk about it, not only because often times parts of it are unpleasant, but also because if it was just open knowledge to the general public then there wouldn't be much appeal in terms of wanting to be a member of the fraternity. The initiation and rituals are kept secret so as to preserve the traditions, culture, values, and mysteriousness (or exclusiveness, not sure what word i'm looking for here) of being a fraternity brother. The secrecy is in part usually do to the fraternity wanting to preserve their traditions and rituals in a country that is constantly trying to destroy and control what it does not know or understand. Also, what would be the point in becoming a a member of the fraternity if everyone already knew everything it was about? The whole pledging procedure is a learning process. Hope that helped.