Lisa @ School Family
Yikes! Could it be that they showed a movie about how things were before civil rights and your son took it quite literally? I would have a conversation with him about history and maybe talk about all the good that Martin Luther King did. There is a great book called, "Whoever You Are" by Mem Fox that does a great job talking about how we are all different, but all the same.
If you talk to other parents and find out that the teacher, in fact, showed an inappropriate movie, then I would go straight to the principal.
Talk to him and explain how we are all different but the same. Explain how people should not be treated differently because of the color of their skin. This is a good time for you to read stories and to do a little research on the internet to help your child learn about different types of history. Give him examples of people of different races that have mad a difference in society; for example, Dr. Martin Luther King Jr. who fought for equality for ALL people. President Barack Obama who is the first African American President. Here is a wonderful website with different culture accomplishments: https://www.biographyonline.net/people/people-who-made-a-difference.html. There is an abundance of information available to digest. Use google as your search engine because it makes it easier to search.