Why is punching another girl that started a fight still seen unladylike even now?

It's some girl I punched last year. She started the fight. I didn't. I finished it.

She seemed shocked... as if she really expected I would slap her around and do the ridiculous rolling on the ground shit. I heard one of her stupid friends saying that wasn't ladylike. Why not?
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Someone that attacks me and won't stop or comes charging after me... I'm not gonna be slapping around. I'm throwing fists.

Basically this seemed her logic: She started a fight but suddenly, I'm suppose to reduce back to only slapping because that's supposedly ''ladylike''. Ladylike is not starting a fight at all.
Why is punching another girl that started a fight still seen unladylike even now?
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