Why are girls criticized harsher in this society?

Us girls. We are called bitches when we speak our mind. We are called sluts just because our dresses and shorts are above knee high. We are called whores simply because we like to hang with the guys. We are called materialistic beings for the small fact that at least we want to look decent in public. I don't know, is the dictionary expired and no longer exist? We are automatically labeled for the littlest things we do - as to how we dress, speak, act, etc. This world needs a reality check.