We've been through this before, but I can't say it enough. The first step is to not push young girls along the softball path. If it is their choice, fine. But if they are comfortable playing baseball they should not be deterred.
The effects of this can extend beyond baseball. A female ballplayer proving herself can teach a young boy a lot about respect and acceptance. My younger brother's friend had a younger sister who I would routinely drag out to run full court basketball games with, she could shoot from the outside far better than most of guys who were only concerned with dribbling the ball between their legs.
There was a girl in my Little League who was an All Star pitcher all the way through early Babe Ruth League. Most of the guys who were on her team at one time or another finished that season with a different opinion about female ballplayers than they began the year with.
I accidentally hit her with a pitch in an All Star game (I might have told you this before). She dusted herself off grimaced in pain a little, but then just trotted down to first base. She wanted no part of the extra attention she may have been given because she was a girl. I apologized to her and told her how relieved I was that she wasn't badly hurt. She was just as worried about how she would be perceived if she made a big show. Her reaction to it made me feel much better and earned as much respect from me as her talent did.