Diversity and integration are extremely touchy subjects. It is one thing to have diversity on paper, but quite another to actually achieve true diversity. Obviously, you cannot have real diversity if different kinds of people are not well represented, but once that has been achieved, it is up to the students to follow through.
Vanderbilt has become more diverse over the last few years, and the admissions board has made a real point of trying to continue to bring different kinds of people into the Vanderbubble. They've really made good progress recently. What remains to be seen, however, is whether or not the students (of all groups) at Vandy are interested in making a concerted effort. Right now, the answer is no.