Since it's too long for most of you to watch, I'll say that was fascinates me about it is the mechanism of his conversion. It was a combination of anger towards him by the students and also others reaching out to him. He didn't talk about his beliefs at school, but because of his famous father having been Grand Wizard of the KKK, some students figured out who he was, and there was a social media eruption where the student body agreed to never even look at him, to treat him as a non-person.
He felt so isolated that when the two other students who are in the video decided to be friendly toward him, he was receptive. The Jewish guy invited him to attend his family's Sabbath dinner. The Jewish family knew who he was, wouldn't discuss his beliefs, but treated him with kindness. He went every week for months. The woman decided to start talking to him about his beliefs and their pseudo-scientific basis. She was calm but persistent. Eventually, he realized that he'd been wrong his entire life. Renounced his beliefs, and his whole family.
It was a version of good cop, bad cop, writ large.