Why are nowadays more girls fighting more brutally with each other?

My parents enrolled me in a self-defense class from an early age. They wanted me to be ready to finish any attack but never start one. They both claimed things have changed and girls aren't into just slapping anymore.

Ironically I never got into any fights (therefore never had to use my skills outside of class) but have witnessed a couple girl fights in my school and one time in college. A couple of time actually packed a punch and were actually more brutal. They didn't just want to rip the another's girl's clothes off nor humiliate her with a slap, but it was a real fight, beating the hell out of each other, punches, kickes included too. A couple of them ended in one of the girls having a bloody nose or swollen cheeks.

My parents are noticed that sudden change over the years too. Why are they nowadays fighting more brutal with each other? What changed?

Why are nowadays more girls fighting more brutally with each other?
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