This passage provides an example of Jos’s insecurity that the previous passage hinted at: when he sees Becky talking about him, his first reaction is to assume she’s making fun of him. Becky’s extreme reaction to the chili pepper shows how, despite her efforts to educate herself and become cultured, her lower-class status and the fewer opportunities she’s had to actually see the world make her less worldly than the Sedleys in some ways. Jos is so afraid that people will judge him that he seems to take particular joy when someone else makes a mistake, as Becky does with the chili.