anastaisia
"you did notice the inverted comma's right?"
You need a better get-out clause than that I'm afraid.
As for teaching my son that he'd be an utter to put his children in humiliating situations just to make a sociopolitical point, I think that's a fine lesson. If he wants to do it himself for himself and understands the consequences, that's up to him and I would support him fully.
NarkedRaspberry
"Actually that's the best way to ensure that your child ends up expelled and with a criminal record while their bullies carry on with their lives."
I'll take that risk over conditioning them to be victim for the rest of their life.
Thumbwitch
"Uppercut - you are of course entitled to your opinion but I have no intention of teaching my child to become an unthinking thug either, thanks. He will not learn to be the aggressor, he will learn to defend himself from other unthinking thugs/bullies. If they get hurt in the process, they'll only have themselves to blame - but he isn't going to learn to smack them before they hit him."
The considered application of physical force, were appropriate, requires a high degree of self control and awareness of the situation. I don't expect you to appreciate this nuance given your naive assessment of those who use violence as 'unthinking thugs'.
If a situation is about to turn physical, especially if you're outnumbered, waiting to be assaulted is stupid. Hopefully he will learn this in his self-defence classes and, for his own sake, not be convinced otherwise by you.