Learn to disagree without arguing!
Social Health has a lot to do with knowing that you can be wrong too. Not everything has to be an argument. It shows great maturity when you can admit you are wrong and move on. There is a lesson to be learned.
For instance, you are in a situation where there were many people involved in a disagreement. Some were very upset and others weren't. The ones that weren't upset likely have a way to back up from a situation.
If you can back up and see all sides of the disagreement, you can see every side, in turn this allows you to see what you could've done differently for a different outcome. The lesson is don't make that same mistake again.
Not everyone will agree on most anything. It is up to you to maintain your social health and be more open-minded. Or to understand that everyone's opinion differs to some extent.