1. She didn't just touch him
2. He didn't "slap the shit out of her." He smacked her hand twice to get her to release him, after he had already told her to let him go.
If you watch the video, she grabbed him and yanked him towards her. You can then see him tell her to let him go. She refuses to comply. He was simply defending himself from an attack. I don't believe he is God's representative on earth, but he has absolutely nothing to apologize for regarding this paticular incident.