Who is Martine from Sag Harbor and what is their importance?

Martine is Benji's boss at Jonni Waffle. He is from the Dominican Republic.The boys at Jonni Waffle debate whether or not Martine is black since his skin color makes it difficult to tell for sure. When Martine pats Benji on the head for a job well done, Benji becomes offended, convinced this is a racial act by a prejudiced white man. However, Benji later learns that Martine is black.