Why were they booing? Gee, that's a great question. Heck if I know.
But, hmmm . . . maybe start with 1847, and the one million Irish who died of famine?
Or maybe the dopey "world wars", that this Eastern European/Central Asian clan called the "British" and "European royals", and the bankers and others who are behind them, started so that they could send working class Brits, Germans and Russians to their deaths?
Or maybe the economic policies pursued by the same establishment, that forced Britons into poor houses, in the 19th century, and into the unemployment benefits line, in the 20th century?
Or maybe because the anthem evokes the puppet politicians and the puppet media, controlled by the same banking cartel and the military-industrial complex, pushing their latest breathless "war" to distract us from the slow collapse of the standard of living and the erosion of freedoms?
No?
Ok, I give up.