For those who aren't familiar, SOH-CAH-TOA is a mnemonic device math teachers tell their students to help them remember trigonometric ratios. It's not hard at all to remember/understand so most teachers spend less than a minute introducing it and get on with the lesson.
For some reason, this teacher felt it was necessary to go full moron and put feathers on her head and pretend to be Native American (or at least her impression of Native Americans) and dance/scream/cry like an insane person for a few minutes. If you watch the video (which was recorded by a Native American student), it is one of the most cringeworthy things I've ever seen.
She has since been suspended by the school district pending an investigation. To those who might defend her and say the students will never forget the lesson, I'll say there are plenty of ways of making something memorable without resorting to making a complete asshole of yourself and mocking an entire culture.
You decide: Is the teacher a racist, mentally ill, on drugs, some combination thereof, or something else?