One scene at the very beginning of the gathering of presidents and prime ministers of the biggest industrialised nations set the mood for facing the brash Trump.
In a statement, The Associated Press reported, a spokesman for Trudeau did not address Trump's tweeted insults.
The two leaders talked on the phone last week after Trump announced USA tariffs on European goods.
He missed Trudeau's introductory statement and entered the room while Gender Equality Advisory Council co-chair Isabelle Hudon was speaking.
The Prime Minister's Office responded by saying Trudeau has been consistent with Trump.
"We're like the piggy bank that everybody is robbing", he said at a press conference as his G7 counterparts continued their two-day meeting in La Malbaie, Quebec, and officials hammered out a joint communique.
Mr Macron's office said France and other European Union countries would maintain their support for the final G7 communique.
According to a report by the Independent, the joint communique stated that the G7 nations need to evaluate worldwide trade rules and develop new ones, if necessary, going forward to ensure an equal trading playing field. Trump had reportedly pushed back on language surrounding climate change, and the final text of the joint statement made clear that the USA did not agree with language surrounding the issue.
But after leaving for Singapore, Trump tweeted personal attacks on Trudeau and said that he had told his representatives not to sign the summit communique, turning what had already been a tense meeting of the world's leading industrialised democracies into a fiasco. Bannon said China is "now on notice that Trump will not back down from even allies" complaints in his goal of "America First'".
Mr. Trump, though, said conversations were cordial and respectful at the summit.
The US has slapped a 25% tariff on imports of steel and 10% on aluminium from countries including the United Kingdom and the rest of the European Union.
"People can't charge us 270 percent and we charge them nothing, that doesn't work anymore", he said.
Russian Federation was suspended from the group - then called the G8 - in 2014 because of its annexation of Crimea from Ukraine. He reiterated his longstanding view that the USA has been taken advantage of in global trade, adding, "We're like the piggy bank that everybody's robbing and that ends".
The communique said the leaders of the United States, Canada, Britain, France, Italy, Germany, and Japan agreed on the need for "free, fair, and mutually beneficial trade" and the importance of fighting protectionism.
Fox Business contributors James Freeman and Kristina Partsinevelos discuss President Trump's upcoming meeting with North Korean Leader Kim Jong Un and the president's recently imposed tariffs. Earlier this week, Merkel said the group is defined by its members' respect of global law, and Russia's 2014 annexation of Crimea was a "flagrant breach" of that.