The programme pretended that sectarianism in Liverpool had all faded away by the start of the Great War.
Not many years ago I worked with a chap from Liverpool who supported Liverpool FC. His father refused to speak to him, because Liverpool are the "Catholic" club, while Everton are the "Protestants". My workmate explained "He's in the Orange Lodge and everything".
Maybe it was not obvious to RT or those making the programme, but there are still those in Liverpool who will treat him as a traitor for marrying who he did.
As for the "class struggle" in Liverpool, there are those who have still not forgiven the dockers there for going on strike in 1943.