There are plenty of ways to deal with a difficult coworker, and one of them involves direct communication. Voicing your thoughts allows you to confront the situation professionally while gaining insights into their perspective.
However, in doing so, make sure to follow tips on effective business communication by being mindful of your nonverbal cues and choice of words. If it doesn’t work, escalate the problem with your supervisor or human resources department so they can take the appropriate action.