There is behaviour that parents shouldn't put up with, obviously.
Wrong. There are aspects of the behaviour of their spawn which parents should darn well know are completely unacceptable to others.
Unless or until you can reasonably control your rugrat, keep it at home!
Some years ago a doting parent left offspring unattended in the local flying club. When I next visited, I discovered that every wall had been scrawled upon with chalk / pencil marks caused by the little $od. But as I was in charge, I wrote in the newsletter that, henceforth, any irritating unattended kids would be shackled to the radio tower outside until their keepers returned. On the first occasion, to the base of the tower and on any subsequent occasion, at the top.....