So true! Unfortunately if you say something to the parents, it will backfire on you. Behind every disrespectful child, there are parents I want to smack upside the head for failing to show their children how to respect and treat adults and other people.
How to apologize correctly. This is phrased in the context of marriage, but I think these rules of thumb are important for any kind of relationship with another human being. it's a harsh, but nice, reminder to be a better person.