In the few months he has been in power in the Philippines, President Rodrigo Duterte has seemingly convulsed relations between his country and the United States, a longtime ally and former colonial ruler. He has repeatedly made vulgar comments about America's president and envoy in Manila and, without much warning, threatened to throw out U.S. special forces operating in the country and end annual exercises with the U.S. military.

Duterte went one provocative step further on a visit to China this week.

“In this venue I announce my separation from the United States," he declared in Beijing's Great Hall of the People. He would go on to suggest that “Americans are loud, sometimes rowdy,” and that their vocal chords are “not adjusted to civility" — a rather peculiar claim given Duterte's notoriously salty tongue.

As my colleague Emily Rauhala reports, Duterte's camaraderie with China has surprised many and compelled even his own officials to attempt to backtrack. The U.S. State Department has expressed bemusement.

“We are going to be seeking an explanation of exactly what the president meant when he talked about separation from us,” State Department spokesman John Kirby said. “It’s not clear to us exactly what that means and all its ramifications.”

Rauhala brings up a crucial point about Filipino public opinion: "Many Filipinos are also perplexed. Though opinion polls suggest the president remains popular at home, his anti-U.S. rhetoric is at odds with public opinion. The vast majority of Filipinos hold a positive view of the United States; many are skeptical of China."

Duterte on how being sexually abused as a child affects his politics

This is undeniably true. According to Pew Research Center's last survey of global attitudes, no country in the world had a greater proportion of people who admired the United States than the Philippines.

In 2015, 92 percent of respondents in the Philippines said they had a favorable view of the United States; only 54 percent said they regarded China favorably. Filipino enthusiasm for the United States was considerably greater than attitudes in other traditional American allies in Asia, including Japan and South Korea. As one Manila-based newspaper put it in 2014, "Filipinos like the U.S. even more than the Americans do."

(Pew/screeengrab (Pew/screeengrab)

That 92 per cent figure becomes even more striking when you set it against Washington's allies in Europe.

(Pew/screeengrab (Pew/screeengrab)

In other words, Duterte's hostility toward Washington is hardly reflected in the broader attitudes of his public. Of course, there is and has always been a constituency in the country suspicious of American activities, first in the form of Washington's imperial rule and then its subsequent military presence. Duterte has championed that set of politics as part of a broader program of populism, raging against corruption and poverty and the elites and criminals who supposedly profit from the status quo.

The most controversial quotes from Rodrigo Duterte Show all 9 1 /9 The most controversial quotes from Rodrigo Duterte The most controversial quotes from Rodrigo Duterte On killing drug addicts “These sons of whores are destroying our children. I warn you, don’t go into that, even if you’re a policeman, because I will really kill you. If you know of any addicts, go ahead and kill them yourself as getting their parents to do it would be too painful” The most controversial quotes from Rodrigo Duterte Message to China “I will go there on my own with a Jet Ski, bringing along with me a [Phillipino] flag and a pole, and once I disembark, I will plant the flag on the runway and tell the Chinese authorities, ‘Kill me’ ” AP The most controversial quotes from Rodrigo Duterte Christmas message to law-breakers “If you do not want to stop, and just continue committing crimes, then this would be your last Merry Christmas” AP The most controversial quotes from Rodrigo Duterte On sex life “I was separated from my wife. I’m not impotent. What am I supposed to do? Let this hang forever? When I take Viagra, it stands up” AFP/Getty Images The most controversial quotes from Rodrigo Duterte On the drugs trade “None of my children are into illegal drugs. But my order is, even if it is a member of my family, ‘kill him'" AP The most controversial quotes from Rodrigo Duterte Insulting the Pope “We were affected by the traffic. It took us five hours. I asked why, they said it was closed. I asked who is coming. They answered, the pope. I wanted to call him: ‘Pope, son of a wh**e, go home. Do not visit us again’” AFP/Getty Images The most controversial quotes from Rodrigo Duterte Joke about rape “I saw her face and I thought, 'What a pity... they raped her, they all lined up. I was mad she was raped but she was so beautiful. I thought, the mayor should have been first” AFP/Getty The most controversial quotes from Rodrigo Duterte Insulting Barack Obama "Mr Obama should be respectful and refrain from throwing questions at me about the killings, or son of a bitch, I will swear at you in that forum" REUTERS The most controversial quotes from Rodrigo Duterte On Abu Sayyaf Islamic militants "If I have to face them, you know I can eat humans. I will really open up your body. Just give me vinegar and salt, and I will eat you. If you annoy me to the fullest... I will eat you alive. Raw" EPA

Reports also suggest that his resentment is personal — connected even to an episode in his childhood when he was abused by an American Jesuit priest as a schoolchild.

“He is a very knee-jerk kind of politician who is extremely sensitive to criticisms and personalizes them,” Walden Bello, a Philippine academic and analyst, told the Financial Times this week. “L’état, c'est moi — that’s him.”

It'll be interesting to see what Pew's 2016 indicators in the wake of Duterte's rise reveal about any shift in sentiment toward the United States.