My U.S. History teacher was a nice woman. She was polite. She seemed like kind of a gentle soul. She was also the first person I met who seriously referred to the Civil War as the War of Northern Aggression. And that's when things got complicated. Even as a 17 year old lifelong South Carolinian, I knew that there were all kinds of problems with that statement. But I didn't say anything.
I didn't say anything because I was 17 and my teacher was nice to me. But of course she was nice to me. I was a respectful white kid who was darn good at U.S. History. This isn't to say that she was mean to anyone. I doubt I ever heard her raise her voice. But it was easy for me to push aside my unease with her language about the Civil War. She was nice and I was not going to run afoul of that niceness unless I set out to do so.