What's happening to your son and how your husband is justifying it is very disturbing.
My mother "bullied" me and it trashed my self-esteem and made it very hard to
trust and interact "normally" with other people as an adult.
I don't think your husband is really working at recovery from this example of "amends"
so the beat goes on.
I'm very sorry you are suffering from his quacking, blaming, and aggression.
That's not much of a family life.