What was the cause of Kody’s change?

He’s always been an egotistical jerk, but recently he has become a cranked the angry narcissism up to an 11. Was this a slow change? His mask finally fell off? Covid? Christine leaving? Psychotic break? Robyn’s influence? What changed?

He’s always been an egotistical jerk, but recently he has become a cranked the angry narcissism up to an 11. Was this a slow change? His mask finally fell off? Covid? Christine leaving? Psychotic break? Robyn’s influence? What changed?