Using a gun, a weapon that can kill to teach a 15 old a lesson is not appropriate. Ever.
I do agree that social services go after the wrong people some times but it’s very clear to see why his daughter would ‘disrespect’ him given his state of mind. The fact that he feels its ok to use a gun on anything is just wrong. Full stop.
All she did was complain, she used words that he used. She knows to use those curse words because he uses them.