"Friends disperse. Bosses fire you. Employees quit. Family members abide."

Why? Give us one good reason why we have to put up with an abusive, toxic, hurtful, disrespectful, mean person just because they are a family member. This kind of attitude totally negates the experience of the adult son -- an experience of an abusive father. Why should anyone continue to put up with that just because of some old saying about blood and water?

"Why not just treat it as a quirk of his personality and let it go?"

Would Dave Eddie say that about an abusive spouse? Or an abusive friend? Or his own dad if they weren't getting along so terrifically well these days? He's basically saying: Shut up and put up with it. Hardly useful advice if you're on the receiving end of someone's abusive behaviour.