If the student holds the lease on the property and is advertising sublets based on racial requirements he is in violation of the fair housing act.
“The Fair Housing Act is a federal act in the United States intended to protect the buyer or renter of a dwelling from seller or landlord discrimination. Its primary prohibition makes it unlawful to refuse to sell, rent to, or negotiate with any person because of that person’s inclusion in a protected class.” (wiki)
Whites are not a protected class. That law only works in one direction.