Hearing about some idiot saying the "1975 thing" never happened reminds me of something that happened to me many years ago. I enrolled in college and took a U.S. History course. I had always been a good student and especially liked history. I was shocked to learn in this class that the U.S. "lost" the War of 1812. I'd always been taught that the U.S. had never lost a war. I did not recall any teacher, in any grade, saying the U.S. had lost 1812 to the British. But there it was in the history books. In 1814, the Brits destroyed and sacked Washington, D.C. burned down the White House to the ground, and the Americans sued for peace.
But the story's been told differently ever since, and I suspect many, many Americans do not know this.