Protesters intend to fly a large balloon over parliament portraying Trump as an orange, snarling baby.
"It's typical, but honestly Donald Trump's legacy will outlive any big orange balloon and the matters that will be discussed at Chequers and now in Brussels are much more important and will have a much longer effect than any day rally", she said.
Nona Hurkmans, one of the activists behind the infantile inflatable of Trump, said the balloon was a fair response to Trump's own behavior and downplayed claims that Trump deserved more respect.
Trump then even went as far as hitting out at Theresa May after she criticised him for the retweets.
After a North Atlantic Treaty Organisation summit where he provoked a crisis session to force allies to raise their defense spending, Trump landed in Britain having described the closest US ally in Europe as being in turmoil over Brexit.
Donald Trump's son Eric has arrived in Scotland ahead of his father's visit to the UK.More news: Captain Kane sends touching message to five-year-old cancer patient Ben
Immediately after arriving in London, Trump and his wife will attend a black-tie dinner in Oxfordshire hosted by Prime Minister Theresa May.
Equally, she said people have a right to protest against policies they do not agree with.
"Trump's political values represent everything that we are not", he told AFP.
"I would be happy to see Hillary Clinton if she was president visit the UK".
According to a notice posted on the embassy's website on Tuesday, "Numerous demonstrations are being planned for July 12 to 14, 2018, surrounding" Trump's visit.
The Stop Trump Coalition-a group of organizations that played a role in planning the nationwide actions-provided a map of the protests Trump's team will be attempting to avoid.
He said: "I recently read a story that in London, which has unbelievably tough gun laws, a once very prestigious hospital right in the middle is like a war zone for awful stabbing wounds".
President Donald Trump touched down in Britain on Thursday, where he will get the red carpet treatment on a brief visit: Military bands at a gala dinner, lunch with the prime minister at her country residence, then tea with the queen at Windsor Castle before flying off to one of his golf clubs in Scotland. After the visit, Trump will decamp to Finland for a one-on-one with Russian President Vladimir Putin on July 16.
Asked about Trump's comments, May said: "We're delivering on the vote of the British people to take back control of our money, our laws and our borders".