Doesn't anybody believe in societal 'norms' any more?
If we don't have consensual 'norms' everything falls apart.
I can't see many of you lot wanting a child to play with yours who breaks toys, physically assaults your child, doesn't understand the word 'no', eats with their fingers and chews with their mouth open, has 'accidents' anywhere in the house or garden etc. etc.
I agree that there is no need to sneer at 'inappropriate' parenting, but to sneer at 'middle class values' which are actually a loose set of norms which has been worked out over the years as being a fairly reasonable way for large groups of people to live comfortably together and keep themselves healthy, seems to me to be rather odd.
We have some pupils whose home lives are desperate and they are not happy children. A bit of 'middle class norms' in their lives would improve their situation no end.