Typical of the type, Vivian is sure ("There is no question...") culturally mimicry is important, even though, at best, there is no evidence to support this theory. Most interesting, however, is how she inverts the function of cultural mimicry. So, for Hispanic children, and for black children, and Asian children and, really, everybody else except white children, it is important for them to see themselves in the literature. However, for some mysterious reason Vivian does not elaborate, it is "imperative" for white children to see others as the major protagonists in the literature.
Isn't that odd?
Not odd, in the sense of rare, just par for the course. Vivian is a racist. She associates a culture with skin color.