He also thought his parents were Satan at times so take with a grain of salt.
On the topic of his parents, I feel really bad for them.
I always wondered how he "became" racist after developing schizophrenia (developing a mental illness can't really turn you racist), like he must have gotten those thoughts and ideals from somewhere. I always assumed that he already held those views prior to his diagnosis, he just kept them "hidden" because he was able to compose himself in a public setting. I immediately assumed his parents must have been racist as well, but when you watch the video of him arguing with his dad, his dad repeatedly questions him about his racist views. IIRC, he says something like "why would you hate another man of God?".
His parents seem like genuinely good people. It must have been really difficult to see their son wither away mentally like that.