It's all gooooood.

By having almost all the stereotypes come from Michael, the writers reinforce the absurdity of them, while demonstrating that you CAN have fun with them (e.g. Darryl helping Michael with interracial communication or maintaining gang discipline, the cleaning staff
happening to only speak Spanish, etc), without having to tiptoe around like ninjas on rice paper, fearful of offending anyone

... ok, mixed metaphor, I know, but "ninjas" fits TO better than "Caine from Kung Fu".