During the gala, a wide-ranging interviewTrump gave to Britain's The Sun newspaper was posted on its website. Activist Leo Murray told the Associated Press that city officials "originally told us that they didn't recognize Trump Baby as legitimate protest".
His highly controversial remarks came at the end of a day in which he had already waded deeply into the Brexit row over May's Brexit vision.
Both leaders said their countries would work out a trade deal.
President Donald Trump arrives at Chequers on Friday.
"It's an opportunity to reach a free trade agreement that creates jobs and growth here in the UK and right across the United States", May told the guests at Blenheim Palace.
"Once we have our agreement with the European Union in place, I'm confident that there will be the latitude and the ability to do a significant trade deal with the United States".
The timing of the comments added to the awkwardness.
Trump will spend very little time in London, having stayed in the capital for a single, well-insulated night at the official residence of the United States ambassador in Regent's Park. "I'm very strong on immigration". A weak prime minister (who is far closer to the Daily Mail) and Brexit in jeopardy, present the flawless opportunity to display power and buy up or unearth more news stories.
A statement on its website reads, "We will make it clear to the British government that it's not OK to normalize Trump's agenda and the hate and fear it has sparked".
'I actually told Theresa May how to do it but she didn't agree, she didn't listen to me. "She wanted to go a different route", he told the paper.
'She has done everything she could to be nice to him and he has gone and slagged her off in the press saying that Boris Johnson would make a great prime minister, that she has messed up Brexit, that the trade deal is dead. And that is fine.
He also told the tabloid that he'd shared advice with May during Britain's negotiations with the European Union and she ignored it. I know they have had a lot of resignations.
"As he said in his interview with the Sun she "is a very good person" and he 'never said anything bad about her.' He thought she was great on North Atlantic Treaty Organisation today and is a really terrific person", Sanders wrote.
"I was very saddened to see he was leaving government and I hope he goes back in at some point".
He said: "I have seen no evidence that this crime has been brought in by immigration from Africa or other parts of the world to Europe". The president began his day reviewing a military exercise alongside May at the Royal Military Academy Sandhurst.
After what media described as Trump's "tantrum", he told reporters that the other North Atlantic Treaty Organisation members had "agreed to substantially up their commitment" and everyone was "very happy".
Trump, this week, has praised Johnson, and called him his "friend". "I think they're going to get on great".
A baby blimp mocking President Trump floated over London on Friday, an emblem of protests that are expected to draw thousands of people who are angry with the American president's policies - and his views of their nation.
Leaked promo material reveals new Galaxy Note 9 S Pen
Also, the fact that Ice Universe , a well-known Samsung leaker, posted it on Twitter is one more reason to trust it. It appears the Note 9 will keep the centralized USB-C port, headphone jack and a slot for the S Pen to slide into.
Donald Trump Publishes Letter from North Korea’s Kim Jong
Pompeo denied that the talks went poorly, telling pool reporters that progress was made "in every element of our discussions". Although the letter was written less than a week ago, it's not clear where US-North Korean talks stand now.