I had a 4th grade classroom teacher that got on a couple of guys in class and told them they had to do something. I don't recall specifics. Neither were troublemakers and one didn't hear or understand her the first time, so he asked: "what do you want me and Eddie to do?" The teacher came back and said she didn't want "me and Eddie" to do anything. He rephrased, "what do you want Eddie and ME to do?" (This, of course, is correct grammer). She did the same thing, insisting on the "he and I" language even when it doesn't apply.
Teachers aren't perfect, and many of them aren't particularly well educated.
My wife is not a classroom teacher but has been asked to teach, at various times, math, science, and history. Good grief, I feel sorry for those kids!