I have to agree Ruth, very rarely does social services or schools get involved with unruly middle class children, but the children reared by single parents (especially those on low incomes)are singled out, drawn into a corner with the patronizing

"Are you coping ok?....." and further reviews.

I have met more children unruly for being spoilt and little discipline given, than the children of parents who may shout at their children to get them inline, then the said parents scolded for doing so.

I know many parents with the same attitude as your friend above.