The person that said that was harsh. avoid sitting near them in the future. if you had downs it would def have been picked up by now. you cant catch a genetic disease, you are born with it. people with downs tend to have a mental age of around 7, it may be slightly higher, it may be slightly lower. but the person that said that is a ****, they were just trying to wind you up, ignore them. if they are bullying you, then report it, dont let them get away with it.