It is simple really, the establishment, well tbf the tories shit on places like Liverpool and Manchester etc and demonise the working class, where once Manchester was the once to vermently fight against the establishment for about 150 years, the scouser (a predomonently tory place till the 1970s) like to pretend they are bastians of the embattled downtrodden, plus thw red scouse try to lay claim to the Irish dispora even though they have the 6th biggest population of such even below Burnley.
And so the myth they have crrated for themselves of the repubic of liverpool came about and though the actual stance is anti tory as the head of state the monarch is associated with any establishment stuff.
Couple with it the cover up of hilsborough, they have a point, not sure why Manchester isn't so anti-tory and establisent anymore tbh.