Humorous, as it shows the lack of Brabantio's care in the political field, he is incompetent -- only woke up from bed to address his daughter's married life.

If he can't do political, can he do personal? And vice versa -- alienates him from the reader -> Alienates from his racist ideas.

Is she a mirror of Brabantio's own fears, and ideals, and therefore so appeals to him -- he compliments what he sees in Desdemona that resembles him, himself.