How is irony employed within Anders's reaction to hearing Coyle's cousin speak?

Anders enjoys hearing the boy's colloquial use of grammar so much that he wants to ask the boy to repeat his words. However, he knows that if he does so, the other boys will think he is being a "jerk" (40) by pointing out the boy's incorrect grammar. Therefore, he remains quiet and repeats the words only to himself as he takes his position in the baseball field.