In any case: it: your college does not single-handedly represent all Black people. Assuming that he does is the same basic mechanism as pointing at one red-haired criminal to support your theory of higher criminality among redheads.
The disadvantaged group of any discrimination also isn't itself exempt from actively perpetuating that structure. It's almost a cliché, for example, that female leaders sometimes act extremely aggressive, especially with female employees, in an overzealous effort to fit in, or to dispel any notions of nepotism.