Yeah, I never learned about anything like this in high school. I did know about viking homosexuality and the forced sterilizations. (I learned about the sterilizations when I read about Norway in preparation for my first trip there. I learned about homosexuality in the course of research for my Vinland campaign.)

There has been a lot of change in the field of history in the past few decades, exposing bias. However, textbooks are very slow to change, and often opposed by government.