I don't think Twain is politically incorrect, or widely viewed as such by those who are familiar with his work. Twain consistently shows an extremely modern, humanistic view of African-Americans, Jews, and Asians that shows he thought deeply about these issues and stands up well today. Twain's views on American Indians do not stand up as well, but those do not make up a large part of his work. I suspect that the problem in schools is the very complexity Twain brings to the subject. Racial topics have become so charged that teachers are reluctant to express their own views or to talk about race in any depth. Twain's popularity naturally is not helped by his use of the word "nigger," then in wide use but now highly offensive. John M. Baker