Aside from the aforementioned faux pas, reportedly Donald Trump also had Her Majesty waiting which is arguably even worse considering the rule is to always arrive before the Queen at a meeting place!
But here's the kicker: On the final day of Trump's visit, Queen Elizabeth II wore the same brooch her mother wore to her father's funeral. Citing the work of the blog Her Majesty's Jewel Box, she explained that the Queen makes hundreds of appearances and always wears a brooch. The Queen donned the American State Visit Brooch. The 14-karat yellow gold piece of jewelry is also known as the American State Visit brooch.
The president and first lady Melania Trump met the queen last Friday.
The Queen's snowflake brooch features 48 sapphires mined from Canada's Baffin Island. The only way this couldn't been more in Trump's face is if she'd been wearing an I'm With Her pin.
This isn't the first time people have speculated that the Queen was throwing shade with her outfit.
While the Queen only met with Trump on one occasion, each day she was pictured during his three-day visit the monarch wore a supposedly "controversial" brooch. "Everybody hated him", Cher, who is an ardent critic of Trump, says. We are talking about a Commonwealth country and one of the main allies of great Britain, wrote Julia on Twitter.
The story goes that last Thursday, Queen Liz was hosting an official visit from the Archbishop of Canterbury and the Grand Imam of Al-Azhar at Windsor Castle. Julie shared her observation once again.
Hand selected by the Obamas from CT jeweler Tiny Jewel Box's vintage assortment, the brooch was crafted in 1950 from 14-karat yellow gold, diamonds and moss agate.
The third meeting with the President was, according to the twitter theory, the most damning of all as the Queen chose a particular well-known brooch; the same one the Queen Mother wore to King George's state funeral.
Express.co.uk has reached out to Kensington Palace for comment on the matter.
The palm leaf brooch.