I think you were justified in asking that as well!

heh, yup, my US History teacher was also a super nice person! She also told us at some point that the Bay of Pigs and the Cuban Missile Crisis were the same thing, which even as high schoolers we were pretty sure was not the case. But she often just didn't even show up for class (we were sent to the library to work on history outlines, which you will be unsurprised to hear none of us actually did), so the amount of actually false things we imbibed was fairly low.

I'm told that earlier classes remembered her fondly, so apparently she wasn't always like that -- I wonder what happened.