"Trump's language and policies hurt people around the world", she said as she held a sign denouncing Mr. Trump's stand on abortion. "As the UK makes preparations to exit the European Union, the United States is committed to a phenomenal trade deal between the USA and the UK".
Ruddy also commented Trump does appreciate the relationship the United States has with Britain, while arguing Germany has not paid its fair share toward North Atlantic Treaty Organisation.
May's future has been tied to the failure to secure a Brexit deal.
The Queen gave Mrs. Trump a "specially commissioned silver box" with a "handcrafted enamel lid" featuring a royal blue center that was created to match the ceiling of the Buckingham music room.
Mr. Trump is in the midst of a state visit to Britain which began on Monday with a series of events at Buckingham Palace including a state dinner with the Queen and members of the Royal Family.
Traditionally, U.S. presidents avoid injecting themselves into the domestic politics of other nations.
Trump calls the protests against him "fake news". "Perhaps you won't be given the credit you deserve", Trump told May.
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Away from the news cameras, Mr Trump spoke with a number of politicians during his stay, including Brexit Party leader Nigel Farage, who said the pair had a "good meeting" and the president "really believes in Brexit".
He joked to the outgoing British leader that she should "stick around" and reach a much stronger economic alliance with the United States once her country finally leaves the European Union. But some on both sides of the Atlantic are nervous about Trump, who has shown a willingness to inject partisanship into such moments. CEOs and senior representatives from BAE Systems, GlaxoSmithKline, National Grid, Barclays, Reckitt Benckiser, JP Morgan, Lockheed Martin, Goldman Sachs International, Bechtel and Splunk were listed as attending. One appeared to be wearing a "Make America Great Again" baseball cap in support of Trump, while the other seems less enthusiastic about the president's royal welcome.
The US president had used a joint appearance with Theresa May to say that the NHS would be "on the table" as part of a "phenomenal" potential transatalantic deal - which followed the comments of the US ambassador over the weekend.
But activists hope Trump won't be able to ignore the 20 foot blimp depicting the President as a baby in a diaper that has been flying 30 foot in the air above the protesters.
What did the Queen give President Trump?
Trump glossed over the protests, saying he saw "thousands of people in the streets cheering" and waving USA and United Kingdom flags, but just a "very, very small" group of protesters.
Some demonstrators have dubbed the day's protest a "Carnival of Resistance".
Trump was asked a question about the opposition Labour Party leader Jeremy Corbyn, who was addressing protesters outside. Taking part in the protest are local environmental, pro-Palestine, and anti-war groups.