My mother let my little sister spank my bullying brother. Do you find this punishment inappropriate?

Anonymous
My brother is 14 and is a bully at school and with our little sister (she's 10). My mother is really upset and some months ago decided to start spanking him again like when he was younger, this time using a belt to be more effective. Last time he bullied my sister and she asked to spank him by herself. He objected and complained but my mother agreed because she said humiliation is a good way to correct him, so forced my brother to bend over the sofa and while holding him down let my sister spank him. She hit him with the belt really hard (I didn't expect so much strength) and my mother had to stop her after a while because it was too painful and my brother yelled and almost cried and now he almost can't stay seated.
I find this punishment really inappropriate, but talking with my friends everyone seems to agree with my mother because it's a good way to change his behaviour (in fact at the moment he's behaving really well). What do you think?
My mother let my little sister spank my bullying brother. Do you find this punishment inappropriate?
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