Why do some girls act tough?

Every now and then you will come across girls that think they are stronger then a average guy. That doesn't make them any more attractive, well at least not to me. How do they even get dates.
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Sorry if I made anybody mad because of this quistion. I am not tring to put anybody down, and I don't have any problem with girls being this way. Some of my best friends are girls who act tough.
Why do some girls act tough?
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