Be culturally aware. Don't be diversity agnostic.

For example, shushing somebody who talks loud for more than half a century will not help for a better, more 'civil' conversation, just raise the blood pressure of the 'shushed one'.

If you see two people yelling in a foreign language at each other - they may be just violently agreeing, not fighting.

Would you recognize the difference between yelling at the kids and yelling to the kids if done in the language/culture different than your own?

Be aware - ask before judging.
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Ко виче?