This is all so horrifically unacceptable. I’m sorry to had to deal with this. I know how ugly this can be. I’m happy you were able to utilize the wonderful services of the ADA. We’ve had to as well, and it helped a great deal.
It’s very unfortunate, but much of the insensitivity comes from a complete lack of understanding of what diabetes is. I’ve found it absolutely necessary to be proactive with staff to educate. Our school system is at least clear about what a 504 plan is, and that it absolutely does apply to a child with type 1. When Caleb was in Kindergarten, an administrator told us he didn’t need it. I think this was discouraging us, not the blatant dismissal that you received. But in any event, I believe it is truly in your and your child’s best interest to have one. I’ve found it ensures clarity on everyone’s part, provides at least some education, although more may be necessary, and simply protects your child when issues arise.
Are you familiar with the Safe at School Program? I’m guessing you are since you’ve already been in touch with the ADA.
There are lots of great videos available for education purposes. They are broken down by topic so you can pick which ones might be helpful to your specific needs.
Also, do you have a copy of Helping the Student with Diabetes Succeed: A Guide for School Personnel? This is a phenomenal resource which clearly states the needs of children with type 1 at school, addresses CGM specifically and also has a breakout by staff personnel of what’s reasonable for them to be responsible for with regard to the student, including the bus driver.
It sounds like you’ve gotten over a huge hurdle with your son’s school staff. For future planning and refinement, these resources might be helpful. I know they have been for me.