Very much agree. It is a very common way to justify one's bullying, by calling it discipline. But the truth is, if there aren't any clear rules and it's up to one's mood, then it's bullying.
Exactly. The only lesson my dad taught me is to be around him as little as possible, and to be as invisible as possible when I did have to be in the same room with him. I never knew what would make him explode.