More than 200 years after the Boston Tea Party, a simple cup of tea served to a British royal at the White House is said to have “horrified” the President of the United States. When King Charles, then-the Prince of Wales, visited Washington, D.C. in 1981, he met with President Ronald Reagan in the Oval Office of the White House, where the “faux pas” took place. David Charter, author of Royal Audience: 70 Years, 13 Presidents — One Queen’s Special Relationship with America, tells HELLO!: “Ronald Reagan was horrified when he had Prince Charles into the Oval Office and they brought him a cup of tea that still had the tea bag in it, and he could see that he wasn’t drinking this cup of tea, and he thought he’d made a terrible faux pas.” WATCH: Prince William and Princess Kate display powerful ’emotional stability’ at State Banquet It’s “a very small little faux pas like that,” David thinks “that somehow only endear each side [the British and Americans] to the other a little bit more”. …