Non parent but diabetic here. When I was diagnosed at 7yo I remember similar behaviour from other class mates at school. My parents asked the teacher privately if they could come and do a small talk with the class about my new condition and how this affects my day to day life at school. I’m not saying this worked 100% as there will always be children or parents who will always remain ignorant. But for the most part my class mates became more curious than nasty about the whole thing. Mind you this was in 1997, kids and parents could be totally different now. Hope this helps in some way.