While I would actually agree with you in some respects - certainly not all of them - if you were to discuss this objectively and politely… we really need to take a different approach here:
May I remind you of the most important forum rule?
- Be agreeable, even when you disagree.
- Unofficially also known as: Agree to disagree
From personal experience, I know what it’s like to have heated discussions. They aren’t always a bad thing if something positive comes out of them. However, in your case, I’d really say:
Slow down a bit. When things become too personal and emotional and the original topic is no longer the focus, it’s a good idea to take a break. Believe me, I know what I’m talking about.
Just take a deep breath - tomorrow, this topic will be forgotten. But if you keep getting worked up about it, people will remember it, and it won’t be forgotten tomorrow. The difference is between having a heated discussion, which everyone has from time to time, and leaving a negative impression. 
