well, most of the time we only hear about situations with bad ending.
I may be totally wrong but this kind of "pax" behaviour is pretty rare and this one could have been easily avoided right at the beginning with some tact, manners and....experience, instead of let it grow to an uncontrolled chaos.
I know, easy to say, another thing to do!
A very "close" friend of mine (no need to say more) is a FA/Purser. For the last ten years, she had to deal with thousands and thousands of men, women, kids and she recall only one person as beeing particulary "difficult" to handle. Difficult but not impossible.
I think it's not only about training but simply her overall attitude while working, the simple fact of just beeing a --->
enjoying her job probably killed in the egg a lot of potential desastrous situations like the one mentionned above.