Now do you mean... Who cares that I'm a knob? Or do you mean... Who cares about the Brando documentary?
As for me being a knob. In the USA being considered a knob takes on a different meaning than in the Queen's wastebasket.
To be considered a knob in the US regards being hung like a walrus and in high demand with the ladies. Whereas in England it defines lost simple minded souls marinating in the juices of their own self satisfied stink. Guys like you.