We are experiencing the results of a generation of parents who have no parenting skills.
If a child is taught repsect at home, that will carry on into school. Sadly, far too many children are not taught the basic concepts of behaviour, only their 'rights', but not their responsibilities.
Mt wife is an ex-head, now a Schools Inspector, and has said many times that the famous phrase - 'Give me the child until he is seven, I will give you the man' is absolutely true.
I recall she told me about two of her pupils from a deprived inner-city school where she was Deputy Head - who were bound for trouble in later life. They are now in their twenties, both are in prison, one for murder.
Discipline has to be the heart of the family, the school, and society as a whole, and we are losing it more and more as each generation grows.