I like to pull out my pump and give that person a quick education on the amazing advances in treatment. I show off the features, explain the basal rate and the use of boluses to cover everything that I eat. I give examples of how I calculate carbs, punch in the number, and receive the correct amount of insulin. If they still insist that I shouldn't eat what I eat, I assure them that my CGM will let me know if I've under-estimated and I can correct before my sugars are out of control. Most folks who get my mini-education are impressed by all of the things my little insulin pump can do for me!