So Uncomfortable–This Priest Slaps A Baby on Facebook During Baptism [VIDEO]

In Church over the weekend the priest was talking about this.

I don't even know what I would do if I were there. This is not good.

A baby who was about to get baptised (or maybe already did) was crying and the priest looked like he was almost yelling at the baby a little bit, but then gets increasingly mad at the baby before he slaps the infant across the face.

It's so uncomfortable to watch especially, watching the parents' and Godparent's reaction. How would you handle this?