Similarly, never assume you know the context. I tend to apply this while driving a lot, when someone is speeding past me. "Idiot! But, maybe his wife is in the middle of birthing his son and he is rushing to the hospital?", helps me keep calm when others act like idiots.
There is also a funny video you can share with people to explain the same idea: https://www.youtube.com/watch?v=U-9Gci8MuHw