Sorry to say, but I disagree. I think that a healthy, open and honest relationship with your parents is a fair goal. If they can't work out their differences on their own and that negativity effects your life and your relationship with each of them, seeking a way to reduce that stress is healthy. Talking to a professional is recommended, at least to show your disappointment in their marriage and communication and to learn how to tell them "hey, your hostility effects my life, and I need you to get along or agree to disagree"