He must think they were in an abusive relationship.
He'd gone from being tormented by his own mother to the affection of an abusive father who regretted ever having him.
He flew into an abusive rage when he saw it.
And, I guess this guy Shipton is abusive, and doesn't take rejection very well.
The writer's indignation at finding it treated with silent contempt by the great scholar, who thought it was the work of a personal enemyAleander - caused him to write a second oration, more violent, more abusive, with more self-glorification, but with less real merit than the first.