Don’t be a bully when you are confronting your difficult person.
It is tempting to want to have our say and then end the conversation. That makes you part of the problem, not part of the solution.
Be willing to have a two-sided conversation, not a one-sided lecture.
Think through what you want to say, say it and then wait for their response. Not easy, but certainly better than lecturing (or appearing to lecture) and compounding the problem.
So, the last time you confronted someone – were you a bully?