I don't think this is an optimal or especially good way of dealing with bullies unless the bullying is so serious that it is a threat to the child's safety. It encourages a habit of appealing to the authorities whenever things are suboptimal, instead of developing interpersonal skills to deal with the problem without an authority. It teaches the child to depend on authorities to save them when things aren't going his/her way.
In my school at least, being a "snitch" had serious social consequences. They were despised, and often bullied more, and more furtively. Someone who can stand up to a bully, on the other, was seen as brave, as a leader.
Also, there are certainly authorities who sometimes offer help in the adult world (as Desrtopa notes) but often an appeal to an authority is difficult or impossible. What do you do if a coworker verbally bullies you? Or an in-law gets nasty? A friend of friend?
Okay, why I think this is a bad idea:
1) It teaches the child that power is in the hands of bad guys and authorities.
2) It is a strategy that is dependent on having a genuine authority that is sympathetic to one's cause (which may not always be true).
3) It is unlikely to directly teach the bully a better way to behave, and is likely to get him/her in a lot of trouble that might affect the rest of the bully's life, especially if his/her identity is revealed (especially ethically problematic with a young child).
4) A person, especially a child, might misunders...
Although my 8-year-old son likes his teacher, he is frequently bored at school. He attends a high quality suburban public school in the United States. He has a lot of traits in common with LessWrong readers, and we would like advice for what he can do to counter his boredom. Many of you must have found grade school more or less tedious. What were your coping strategies?