Left-wing writer Johnny Speight said he wrote the series as a critique on right-wing, working-class bigots such as Garnett. However, many viewers let Speight and Warren Mitchell know they agreed with the character's views. Black comedian Lenny Henry argued that while the series was well-intentioned, having a central character such as Garnett spout prejudice on national television did actually provide fuel for racist bigotry in society.
In 1973 the BBC suppressed a report showing that Alf Garnett's strident views in the series actually reinforced the prejudices of bigoted viewers. At a meeting on July 18, 1973, BBC director-general Sir Charles Curran said the report had diminished his confidence that it was possible to make "anti-prejudicial comedy".
Warren Mitchell was less than six years older than Anthony Booth, who played his son-in-law. Booth's year of birth was often incorrectly given as 1937, but he was actually born in 1931.
Anthony Clark of Screenonline stated, "Sadly, Speight's defence was far from watertight - having a white actor, Spike Milligan, black up and don a turban in one episode is clearly questionable", and added that "In Till Death Us Do Part, Alf's lengthy rants go largely unchallenged; his wife does little more than raise an eyebrow, while the responses from daughter Rita and the wholly unsympathetic Mike are often little more than impotent quips or frustrated laughter."