I hope they can at least treat with him with more respect later on in the story. He's being lambasted left and right yet he rarely has any opinions about it. Especially since he has the vampire princess inside his body
I remember reading through this novel, It really highlights how much of an actual jerk an ore-sama type love interest are in real life settings compared to where the heroine is an all-loving airhead in shoujo stories.
I think the prince is a subversion about oresama type guys in romance novels. In any other setting where the heroine isn't an airheaded all-loving maiden, Prince Leo would be an overbearing person of authority