race discrimination

Can Remarks About Race Be an Indicator of Discrimination Against Me?

I have been working in a restaurant for 3 years as a bus boy. I have the experience to be a waiter. I am African American. My manager keeps calling me "boy." He seems to think that it is okay to refer to me as "boy," when none of the other white people get names like this. I think he is not promoting me because I am African American. Is this legal?