Why do girls think it's funny or ok to kick a guy in the balls?

All through school some girls would do it just to "see what would happen", then laugh at the boys when they collapse and cry. And they would show no regret or compassion.
How are those girls any less disgusting than boys/men who hit girls/women until they cry and then laugh at them?
Why don't boys feelings matter?
Why can't you see that something like this can be traumatic for a boy and destroy his selfworth and his trust for the other gender?
Why is "curiosity" an excuse for something like that? Little boys are curios as to how a girls breasts feel like, does that mean they should just be able to touch them? No, of course not!

Can you explain to me, why girls don't feel bad when they see a crying, helpless and hurt little boy?
I often feel like women think we have no feelings, and that our lifes and happiness matter less than theirs. Is this true to some extend?
Why do girls think it's funny or ok to kick a guy in the balls?
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