Final answer:
The biased language in Line 4 is a gender stereotype, suggesting all boys stick together regardless of the situation, which enforces a generalized view about male behavior and loyalty.
Step-by-step explanation:
The biased language found in Line 4 of the dialogue is related to gender stereotypes. Haley accuses Kenneth of sticking together with his male friend as part of a "code" that supposedly applies to all males, which suggests that all boys behave in a certain way simply because of their gender. Such a statement reinforces a gender-based stereotype, as it implies an inherent trait among all boys that drives their actions and loyalty.