Am I wrong to think every girl should kick white men in the nuts from time to time?
That's inappropriate. Why do you think girls should do that?
I often fantasize to kick white men in the nuts
That is wrong. Attacking someone based on their race is racist. Don't do that.
But if I kick a white man in the nuts, it'll be the same as if he did it to me.
It's not okay to want to harm someone based on their race. Try to get to know people for who they are rather than based on their skintone.