Nigerian President Muhammadu Buhari responded to Cameron's slam not by demanding an apology, but rather the return of stolen public funds that he said are stashed in British banks. During the Panama Papers leak, Britain came under fire for managing a network of tax havens across its crown dependencies and overseas territories that attract the type of ill-gotten money corrupt Nigerians would want to hide.
The negative impact of Britain's successive invasions of Afghanistan is harder to parse. In the mid-19th century, Britain attempted to conquer the country and create a buffer zone between Tsarist Russia and colonial India. Its efforts to directly install a puppet ruler, however, ended in bloodshed. Toward the end of the first Anglo-Afghan war in 1842, Afghan tribesmen massacred a joint force of 16,000 British and Indian soldiers retreating from Kabul through a snowy, mountainous pass. A single British army doctor escaped from the ambush alive.
After Britain gained control of Afghan foreign affairs nearly 40 years later in a second military exploit, it transferred a huge part of historical Afghanistan to its crown jewel: India. The Afghan territory acquired by British India comprises nearly 60 per cent of modern-day Pakistan and currently serves as a regional hotbed of Islamist militancy. Many of the Pashtun tribes that straddle this restive border region have fuelled the Taliban with footsoldiers and commanders and play host to foreign al-Qaeda leaders.
In China's case, leaders in Beijing have avoided drawing attention to the Queen's concerns about their rudeness. China is trying to protect its blossoming financial relationship with Britain; both Beijing and London promoted Xi's state visit in October as marking the dawn of a "golden age" in British-Chinese relations.
A nationalist backlash over London's perceived arrogance or amnesia over its imperialist past, which included colonising Hong Kong and otherwise forcing China to accept opium as payment for its tea exports to Britain, could jeopardise that. Xi's reputation is also on the line, and he is known for having thin skin when it comes to gibes about his personality.
Beijing is reportedly censoring foreign reports of the HRH gaffe, while state media outlets have omitted references to her unguarded remark in their coverage of the Queen's garden party at Buckingham Palace. Instead, Chinese media focused on Elizabeth's fashion sense.