> In every country, men commit almost all violent crimes. In school, boys physically bully other boys. Hence the physical punishment for them.
As I've said, and @echoangle repeated, caning is used for cyberbullying, which girls do too (at a rate relatively close to boys actually). If the law was caning in response to physical bullying, and it just so happened that the vast majority of offenders were boys, I would not object on the basic of sexism (I still would not approve of schools being allowed to physically punish students).
> Yes, for homo sapiens, the female is more fragile than the male. This is basic biology. I'm sure that in praying mantis society, females get harsher punishments.
There's no way the typical 16 year old girl is more fragile than the typical 9 year old boy, yet only the latter is subject to this punishment. Until children reach the age of 12 or so the strength difference is quite minor (and there's even a brief period where girls are taller and heavier).
Also it's absurd to punish demographics differently based on their statistical averages. Redheads are less sensitive to pain, should your hair colour determine how many strokes of the cane you get?