Its not just that he punched her. Its the fact that hes bragging about it and admitted to punching her as hard as he possibly could. That is sick. If i had a sister who was actually trying to hit me i would just shove her away. You dont punch women, ever.
I was proud of hitting my older sister.
I'm a guy and my older sister is 3 years older than me. She used to bully me all the time, until one day I have grown strong enough to beat her up. (althought I was still smaller than her in size)