Not only was Trump late to meet the queen, he struggled to walk next to her, instead deciding to walk in front of her. "This is disgraceful," Milano wrote. "SHE'S THE QUEEN and she's 92 years old! You're incapable of acting like a human being. You're incapable of being a leader."
After criticizing UK Prime Minister Theresa May's leadership in an interview, then denying he criticized her, he held a joint press conference with her, calling immigration a "very negative thing" for Europe. He advised European leaders "better watch themselves" because immigration is "changing the culture."
That prompted director, producer and writer Judd Apatow to call Trump "a Nazi," adding, "We don't need to dance around that any longer. He has decided to be open about it."
Ken Olin, director and executive producer of "This Is Us," tweeted that for the Brits, Trump might be the most hated U.S. President since George Washington. Before Trump even set off on his visit, Olin said, "Pssst. He's out of the country. Quick - let's make America America again!"
See more reactions from some of the president's most famous haters below, along with video of that Trump baby blimp because we know you want to see it in action.
A giant balloon caricature of President Donald Trump as a baby was flown over Parliament Square during his trip to the U.K.
If he won't hold an umbrella for his family when it rains and if he sexually harasses and assaults women and cheats on his wife constantly and cons students then this really isn't that shocking. https://t.co/v10LcUMEon
London mayor Sadiq Khan permitted a 20-foot-tall angry "Trump Baby" blimp to be flown during his visit to the city. Khan on why he allowed the protest: "Can you imagine if we limited freedom of speech because somebody's feelings might be hurt?" #theshade https://t.co/yAnvxoye0z