The guy is a loon, but he is a clever one. He is basically using divide and conquer in the same way that his party have done for the whole of their leadership so far.
I have been teaching for 4 years, including my NQT, and I can share some things that I have learnt:
Firstly, the WORST teacher I ever met was in a private school. He arrived with a fantastic reference from another private school and they apparently couldn't get rid of him. However, the second worst teacher I knew (who was actually very good in the classroom but had an issue with marking) was in a state school and he was got rid of within 6 months of problems developing.
Where teachers have struggled with behaviour it has almost always been due to a lack of support by the senior staff. When behaviour problems occur, perhaps due to a bad mixture of students in a class, the 'rumour' spreads amongst the kids that a teacher is 'soft' and it also spreads to parents. So it begins. The management don't punish the students they punish the teacher. The cycle continues.
Behaviour is definitely a management issue - I have done placements in a whole range of schools, from deprived areas to a private school and the cycle above is always true, unless a good behaviour management policy exists. When it doesn't, you can forget how good the teachers are, go somewhere else!