Wow... really?
I personally would be more concerned with not catching the flu, since diabetes can be regulated as a condition. That and flu shots only come around once a year.
I already have plenty of people who could be called experts on diabetes that I'm related to anyways, since it's a genetic thing from my mother's family (my grandpa had it, my mom has it, two of my cousins have it, and one or both of my aunts on her side have it, among other cases that I may not be aware of).