The ugly nature of the transgender debate – and the viciousness of those who seek to silence others who disagree with them – has arrived in the playground. At a private girls’ school, a sixth form student was surrounded by a mob of dozens of fellow pupils who spat and screamed at her. Her ‘crime’? Questioning a visiting politician’s views about trans rights during a debate and making the point that ‘sex exists’. That girl has now left school and is studying at home. Schools should be places where children can develop their own ideas and debate them. So what has gone so badly wrong?