Here's one approach, along the lines of overcoming having a weak defense by having a good offense. Rome used it 2000+ years ago to defeat the pesky Hannibal.
Become more aware of other peoples foilbles and defects. In any interactions that are unpleasent, focus on that aspect. Not to attack, but to understand and realize they are just acting out, being bullyish, childish, selfish, etc, etc, etc.
You know you are OK, and they are just being stupid. See it for what it is, children yelling and arguing in the playroom. Get above it perspective-wise. You may find you even pity them. Don't let them in on what you are doing. Just be detached and diffuse it as best you can by being a neutral adult.