Neither do I agree with him, what he says is appalling. In any case, what he suggests would not have the desired effect!
I also think the person who comments, Karen, could handle things better with her daughter and family; a little grace and goodwill on both sides would help. Tolerance of bolshie teenagers for a start, her grandson is probably quite normal by most standards and in five years will have calmed down a bit. Does she want to completely alienate her family?
It's beyond me why people are so extreme, or what they get out of it apart from a sense of self-righteousness.