I have mixed feelings about this, because I've seen both sides intimately. There are definitely parents of assholes, and parents who screwed up but won't be forgiven, for sure.
But I've also seen deeply narcissistic parents hang out in forums like this, who either refuse to, or are incapable of, acknowledging everything they did to drive their children away, even to themselves.
Take the comments with a grain of salt, is all.