Back to point of Julie's complaints --- we're adults here and if there's a pattern of behavior from a coworker, then documentation is your best friend. In fact, that should be an automatic rule: any communication with colleagues in the workplace should be documented, either via email or chat, and kept short and to the point otherwise. If there exists a friendship between coworkers and there is fallout due to conflict, assuming there is no evidence, the accuser/accused should just let it go because that's what friends do. You can't demand professionalism when the principle hasn't been observed in the first place.
Being a man, woman, father, mother, doesn't absolve one's responsibility from presenting evidence for the truth, even if they have a history of being honest. More importantly, our attitudes towards the accused should initially be of giving benefit of the doubt.