It means that hes a idiot and the reason it says perfect is because hes such a idiot hes became a perfect idiot i dont know if that made sense but basically he is just a idiot and hes such a idiot that hes seen as the model idiot
Have you even read the book? The socs are the rich kids that often jump the greasers. The greasers are poor and are looked down upon from a standpoint from the regular townspeople. Takes place in Tulsa, Oklahoma.