My pit bull growls at only men?

I've had my pit bull since she was very young (almost a year now). She is great with females and males she has known for a long time. She is gentle, sweet and very loving. She is affectionate towards my two young granddaughters. The problem is she barks and growls like crazy when men enter the house. She has been socialized since she was young and has never been beaten or hit. When a male tries to pet her she will run away. I'll hold her still and have them pet her so she knows men are not evil but she continues to freak out. How do I solve this. Im worried that she will attack some man. And how do I solve her jealously towards my other two dogs?