

The nonsense about how nobles are supposed to behave did happen in various medieval aristocracies; basically the idea is that without strict boundaries elitism disappears and the aristocrats lose their power soon after- elitism is what keeps everything running smoothly even when the aristocrats are dolts.
I think what we were shown was that he was a hothead with a hate boner for weird builds. Was Isaac a bad parent for that? Of course.
Do parents that beat their kids say they also love their estranged children? I guess, probably?