...immature and petulant... On the contrary Eliza.

The daughter was old enough to have and misuse her own Facebook account. The Father was fully justified in dealing with this in a way that made her aware that there were consequences for her actions.

She was the one who took the matter outside of the family. Why should she not have been held responsible? The Father's response was appropriate as he was the one who was dealing with an immature and petulant teenager.