In the book Rain of Gold what are some discrimination that Lupe faces?

In the United States, many of the Mexican people are surprised to find that they are treated the same here. The middle and upper class white population looks at the poor Mexicans as dirty, uneducated, and inferior. When Juan is asked to leave a Greek restaurant just because he is a Mexican, he is surprised to be treated as, "dog shit, down here, along the border." (Chapter 14, p 232)