This has been spoon-fed through media and our history books. Ten years ago when I taught at a school for children special educational needs, we had a history book that said, "Slavery was when black people worked long hours for free." That was it. That was the chapter on slavery. Also, many shows depict romantic relationships between an enslaved black woman and her white enslaver. This is definitely part of the "it wasn't that bad" idea, even romanticizing it.