Girls: My bestfriend hit me on the crotch only for fun. Is this normal?

Sometimes she throws a punch , kick or throw something in my crotch and is just laughing.

I asked her why she does it and she said it's just for fun. I explained that it hurts a lot and she said that is precisely why it's funny.

Is this normal?
What could I do to retaliate for her to see how bad it is to be in pain and be someone laughing at you?
Girls: My bestfriend hit me on the crotch only for fun. Is this normal?
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