Sarcasm wasn't designed for these people. They're simple people that will never allow themselves to be educated. Sarcasm is not for them, it's for the people around them.

You will never be able to stop the simple minded racist with your educational movie. He only consumes media that appeals to him. "Go woke go broke!" as they say. If you want to get through to him you need to appeal to his smarter friends and family. You can bring them together with sarcasm more than any other tool, because two people of opposing views can relate to the same media.