No, no, no!!!! I absolutely do NOT find it acceptable for boys or girls to pop each other in the face. My children are taught to treat people and things with respect and they are taught the Golden Rule.
I was making a point from my own personal perspective and my memory of fights at school when I was a kid. Boys got over it quickly and girls didn't. Certainly you did not see me saying it's OK for a boy to hit another boy in my post. Sorry if it looked that way.
; )