Start with the simple. Don't be a bystander. "Next time I see somebody berating a retail worker, I will defend them"

Although it usually needs to start more introspectively: "Next time I am about to lose my temper, I will take a deep breath and consider if yelling is the best course of action or rather something less aggressive."

With children, there's something to be said about them learning to stand up for themselves; tattletales aren't something to admire. But at some point it is actually the correct course of action to interfere with children-raising, especially when it affects my children.