Science fiction implies that the knots of terrestrial racism will eventually loosen because Terrans will have to unite against the aliens, androids, or BEMs [Bug-Eyed Monsters] of the galaxy. Under these circumstances, humans become remarkable for their humanity, not their ethnicity. Robert Scholes seems to have this concept in mind when he remarks that science fiction as a form “has been a bit advanced in its treatment of race and race relations. Because of their orientation toward the future, science fiction writers frequently assumed that America’s major problem in this area—black/white relations—would improve or even wither away.“ . . . While Scholes and others conveniently assume that distinctions based on race will become invalid in possible future worlds and that it is therefore unnecessary for a character to have a distinct racial background, their presumed total eradication of distinctions based on color or ethnicity seems doubtful short of the Millenium.
Sandra Y. Govan, "The Insistent Presence of Black Folk in the Novels of Samuel R. Delany", BlackAmerican Literature Forum 18.2 (1984): p. 44