Hello there!
The answer is: She is unwilling to embrace any aspect of multiculturalism because she detests American culture.
Grandma considers that girls from Mexico are better because she was brought up to that culture. In addition, she thinks that the "Okies" were brought up differently from the way she is brought up; therefore, she does not want her grandson to mix his culture with "Okies."
Hope this helps.
In the start of the story the bazaar was used to show his need for a more entertaining life. It showed that he wanted to escape his monotone life and feel something more alive and energetic. Alas, when he finally reaches his area he sees it is simply commercial, it isn’t truley what he wanted. It shows him that he dreams and yearns for something but that something s8nt really exciting or notable.