School Descriminating against my autistic brother

Recently, our school got a new head. The last head was so good with my brother but, clearly, lacked in other areas which lead to her being suspended. This new head - I purposefully am avoiding names - isn't being particularly helpful with my brother despite his so-called experience with ASD children. It's October and recently; in the last week- the assistant head and Head have suggested to take my brother home for the day due to him not attending lessons. The reason he is avoiding lessons is fear of being taken from them by the SENCO and assistant head into the assistant head's office where he is shouted at and called a "baby". Recently he has made friends with the assistant head so I belive she was under the impression he WAS misbehaving but is now more informed however the SENCO knows full well of his condition yet contiuously seems to wind him up; removing him from lessons to shout, or give him detentions. It has got to the point where him seeing her in the corridor leads to him becoming stressed and even angry. In the last week the Head has once implied and once said outright to my mum that she should consider moving him to a different school; my mum is particularly against this as he has friends at this school, and he can't make friends easily, and also there are other reasons. But can he suggest this? All my brothers teacher that I have met love him. They know he is hard work but that he is good and with a little praise he will be their best friend and do all their classwork with no complaints, but the SENCO, and headship team just don't see this side of him and they think he misbehaves. Its a shame because obviously as he is my brother and I am with him 90% of the time and also know that whilst he CAN be hardwork, and irratating he can also be well behaved and polite. So again my question is can my Head teacher suggest my mum moves my brother to a different school due to his ASD?