Which particular events ruin Cassie's day in Strawberry?

At the store, TJ shows Stacey and Cassie a pearl-handled revolver in a display case, which he says he wants badly. He gives his mother's list to Mr. Barnett, but Mr. Barnett stops waiting on him to take the orders of several white customers in a row, including a young white girl. It has been almost an hour, and even though Stacey and TJ try to stop her, Cassie marches over to Mr. Barnett to remind him that he has forgotten about them. He responds angrily, telling her to get her "little black self" back to waiting and calling her a "little nigger." Cassie protests, until Stacey begins to drag her out of the store, and Mr. Barnett tells him to "make sure she don't come back till yo' mammy teach her what she is."

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