What this rather icky episode demonstrates is the sheer folly of the idea of racial supremacy. The McNabs live in a state of conquerable squalor, in a ramshackle house infested with roaches that look like raisins, and where their mangy, yellow-haired mutt is allowed to take a pee wherever he likes. And yet, despite this, they still believe themselves to be racially superior to the African-Americans who live in the East End of Two Mills.
Poverty should unite East End and West, but it doesn’t. Instead of seeing themselves as in the same boat as their neighbors across town, the McNabs cling to a misguided sense of racial superiority. Their whole attitude seems to be that although they don’t have much in life, they still have their race, something that sets them apart from the East Enders. And to white supremacists like the McNabs, that’s what’s most important.