It is rude to call somebody a bitch.
Phil does not get along with a female coworker who constantly antagonizes him.
Phil wants to get his coworker to leave him alone.
Phil refuses to get drawn into further altercations with his coworker and approaches HR about her attitude.
Phil is drawn into an argument with his coworker and in anger he calls her a bitch.
Phil is able to acheive a workable relationship with his coworker after HR intervenes.
Phil is reprimanded when his coworker reports him.