Racism and cultural insensitivity

It became apparent in chapter 5 that the narrative of the Joad family is only one perspective of the struggles people faced in the 1930s. The use of racial slurs and culturally insensitive language reminds us that the Joads, although they are a poor family lacking many basic resources, they do have the privilege of being white. The use of the word "nigger" and the highly insensitive way of speaking about Native Americans remind us that whiteness was a privilege that could elevate the status of even the most desperate farmer.

I wonder how this theme of race and culture will continue to develop over the course of the novel. What will the presence of race and racism continue to teach us about the social fabric of the U.S. in the '30s?