Forgive me to play the devil's advocate here, but let's assume the following for one second:
you don't have a spoiled kid like this on board but somebody you really admire and look up to. Now she or he does something that you don't like to see at all but is still short of something that you absolutely must report to the authorities. Wouldn't you look the other way in this case and say: 'Hey, let's cut her / him some slack'?
I'm not ratting on my passengers and what they do or talk about is not my business - as long as not doing something about it wouldn't bring me and my crew in trouble or was grossly unethical for other reasons.