I was familiar with this teacher's work, but had never seen the full video. I was struck by her use of 'red, white, black, yellow' to designate skin tone and cringed a little bit, since these are very out of usage now. However, I applaud her work. It doesn't surprise me that it took a short time for the children to 'turn.' I am familiar with both the Stanford Prison Experiment and The Wave, and how quickly those involved turned. She was definitely playing with a bit of fire there, but she did it extremely artfully. For 19 years I taught in a very diverse school, children from all over the world, and yes, racism/prejudice came up from time to time. I tried to meet it head on, and use it as a teaching moment.
During my years teaching, I encountered a lot of unfamiliar names that I had to learn to pronounce. Since my last name is so frequently mispronounced, I have always been sensitive to that, so I made an effort. I asked students to correct me if I pronounced their names incorrectly. I assumed that is what you did, what all teachers did. I was disappointed to learn I was wrong; some of my colleagues often complained that they couldn't pronounce certain names, and wished the students would take "an American name." I found that abhorrent.