Frankly that sounds like assault on a minor. Adults should not approach children out of the blue and give them a piece of their mind about anything. Only if a child is being disruptive would that be acceptable.
well I would love to see them now, but my daughter said she only told me later so as I would not get into trouble with them.
Proud of her, but also pissed off I could not have had a few choice words with them about it.