Please forgive me, but I laughed out loud.
If it makes you feel any better - I read a lot of books by British authors when I was a kid. I can't remember if this happened in the second or third grade, but we had a spelling test, and my teacher
marked mine wrong when I wrote "neighbour," and "favourite."
I took whatever book I was reading at the time, looked through it, then, armed with my proof and the spelling test, I marched up to her desk and told her
I thought
she was wrong. I
had spelled those words correctly, look here...
She briefly looked where I was pointing, flipped my book closed, looked at the author, and brusquely said, "Well, yes,
but he's English."
She was not amused when I, in my innocence, said "I thought we were learning English."