As much as I agree with you that a lot of young kids today show lack of respect for everything. What you did will solve nothing. Quite the opposite actually, what you show him is that being bigger and larger build can do a lot more in the cruel world. What you did is make yourself feel good after an argument with a kid. You shouldn't take justice into your own hands.
I don't know what's the world like in Australia, if it's in NA, that kid will probably want to get a gun and get more "respect" while building himself up in case of running into bullies like you.
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