Name calling is rude.
Mike is dating Grace, and he is stressed out with his new job.
Mike wants to be able to perform better at his job role.
Mike feels supported by Grace while he becomes better qualified in his work responsibilities and always has sweet endearments he calls her.
Mike calls Grace ugly name while he is training at his new work role and continues taking out his frustrations on her after training.
Grace adores Mike's nicknames and grows to care for him more because of his words of affection.
Grace gets fed up with Mike's mental abuse and breaks up with him.