This is a bit of a friend-of-a-friend story, so it is difficult to evaluate the veracity but here goes.
I once met a woman from Germany (2011, so some time ago now). Her friend had been to the US via some school exchange program. If I recall correctly, the state she went to was Texas but I could be wrong. Anyway, the teacher of the class this friend went to still thought that Adolf Hitler was the ruler of Germany, so she had instructed all students to stand up, do a Nazi salute and say “Heil Hitler” when she first entered the class room. She immediately left the class room, crying.
From what I remember, this supposedly happened a few years prior to me meeting this person and being told the story, so maybe 2008? I can only really vouch for the first part of this story, I was really told this. I cannot know if the rest is true, but I believed her back then at least.
Long story short, there are some backwards people on this world indeed.