We really must get beyond this adults vs kids thing.
Often the reason kids are misbehaving in the first place is due to the adult’s attitude in some way.
I recently overheard a terrible case on the train the whole journey 2 hours consisting of a child saying rude words, was minorly naughty, and wouldn’t sit still.
The adult responded “Shut up”,” be quiet” and, “Sit still”.
This went on for 2 and a half hours.
Very very gradually the adult became ruder and ruder to the child and more aggressive eventually threatening a slap etc.(which never materialized_ the sound of these inept morons droning on and on as we passed some of the most beautiful countryside in Europe was really grating.
We felt like saying to the lot of them as they got off “Thanks for spoiling our peace and quiet with your pathetic fleah size little squabble you complete anti-social idiots” and the we wondered why parents go AWOL and do themselves in.