Racism Racism was the idea that all members of a race were superior or inferior to another race . An individual with this belief was known as a racist . Some words used to humiliate other races were also described as racist . ( TV : " Remembrance of the Daleks " , " Human Nature " / " The Family of Blood " ) By humans . While visiting Regency London in 1814 , Bill Potts was subjected to racist ( as well as sexist ) remarks from Lord Sutcliffe , referring to her as a " creature " and demanding she " show respect in the presence of [ her ] betters " . The Twelfth Doctor responded by punch ing him in the face , knocking him down . ( TV : " Thin Ice " ) While Martha Jones was working as a maid at the Farringham School for Boys in 1913 , Hutchinson made several racist remarks to her . ( TV : " Human Nature " / " The Family of Blood " ) She also feared that she would be carted off as a slave in Elizabethan England . ( TV : " The Shakespeare Code " ) In 1941 , during the Second World War , 2008 native Toshiko Sato was insulted by American s in the Ritz dance hall because she was Japanese . ( TV : " Captain Jack Harkness " ) In 1963 , a sign hanging in the window of Mrs Smith ' s Shoreditch boarding - house read " NO COLOUREDS " , which Ace seemed to be disturbed by . ( TV : " Remembrance of the Daleks " ) The house of Ace ' s friend Manisha Purkayastha was firebombed by racists in 1983 . ( TV : " Ghost Light " ) In 2009 , when Wilfred Mott remarked he was saved by the cactus es , the Tenth Doctor replied with , " That ' s Cacti " , to which the Vinvocci exclaimed that it was racism . ( TV : " The End of Time " ) Freda ' s house was burnt down by racists in 2069 because of her alien mother . She was saved by a member of Torchwood , who sent her back in time to 2009 via the Rift . ( AUDIO : " Asylum " ) Roz Forrester found it difficult to understand the racism and sexism she experienced in 1919 Paris , since such attitudes did not exist between human s in the 30th century from were she came . ( PROSE : " Toy Soldiers " ) Dahh - Ren briefly branded Bill Potts a racist after the latter expressed surprise at his blue skin . ( TV : " Oxygen " ) Amongst other species . The Dalek s ' belief in their innate superiority and need to maintain their racial purity led to inevitable conflict between the Imperial Dalek s and the Renegade Dalek s . As Ace succinctly put it , " They hate each others ' chromosome s . War to the death . " ( TV : " Remembrance of the Daleks " ) Time Lord s had become hated by the universe due to the Time War . Cass instantly hated the Doctor when he told her he was a Time Lord , refusing to be rescued by him and telling him to go finish destroying the universe , despite his claims to have never fought in the war . ( TV : " The Night of the Doctor " ) Even Clara Oswald was disgusted with the Time Lords , calling them monsters who had to hide out at the end of time because the rest of the universe hated them . ( TV : " Hell Bent " ) According to the Fifth Doctor , the Pakhar s found the term " rodent people " extremely offensive , even racist . ( AUDIO : " Nekromanteia " ) Jeff Shrubb was accused of stirring up racism , sexism and homophobia on Olleril . ( PROSE : " Tragedy Day " ) Behind the scenes . " The Black and White Minstrel Show " was known for its racism in the 1970s . Controversially , an Alpha Centauri made a guest appearance in 1972 .