During the final match in Antwerp 1920 Olympic Games, Belgium lost the final against the team of Great Britain with 3-2. Belgian fans, quite unhappy with the decisions of the Swedish referee started “booing” when the band played “God Save the King”. Extract of “The New York Times” of August 28, 1920 with title: Crowd at Olympics boos British Anthem. Victory of England in Water Polo game angers spectators. Apology is demanded....”
Source: The NYT archives