I had a meeting similar to this, but my daughter had only just started Year 1 at school, and she was really struggling in the classroom. The meeting was to discuss with us her parents, that they felt she had something else causing her problems; on checking it out several times over the years she was eventually diagnosed with dyspraxia, adhd & learning difficulties. The teachers may feel something else was causing your son's behaviour. If you feel he is being discriminated against, take some advice from your local Parent Partnership; if they can't help you, they'll advise who can. The school may want you to investigate further or indeed they may want to initiate a 'Statement' which will allow a team of professionals to check your son to see if he has some sort of disability causing his behaviour; if he does, then he will be entitled to further support in his education