If that's all you want to do, then lots of smiling and nodding is your ticket. The docs are usually in a hurry anyway.
However, if you want to develop a better relationship, then it's more complicated.
One thing I might try is to bring a list of all the things that can affect blood sugar. Things like the variability of insulin and food absorption. Our fat tissue and our gut do not absorb insulin and food the same way each time. Each meal is complex enough for the gut to process and absorb differently. Simply changing the order that you consume the things on your plate will change your after meal BG profile. Include things like losing sleep. Make your list long and concrete! He'll get the idea.
Exercise duration, intensity and the time of day all effect how your BG responds. Stress from family/social interactions can skew blood sugar. Levels of other hormones (cortisol, glucagon, amylin come to mind), not easily controlled by anyone, much less a diabetic, all effect the interaction of food, insulin, and exercise. I don't know if you're a woman, but female hormones triple the complexity!
Is your doctor diabetic? Does he have any idea how hard it is to control blood sugar in manual mode? The healthy non-diabetic's endocrine system is an elegant and finely tuned metabolism that makes delivering insulin sub-q like comparing a toy airplane propelled by a twisted rubber band to a super-sonic air transport.
Tell him you do the best you can with very crude tools. Heck, our blood glucose meters accuracy are rated at +/- 20%, for gosh-sakes! Tell him you don't like being judged by him and would rather have him on your side when you're up against diabetes rather than you feeling like you have to struggle with the whole world, the doctor and diabetes pushing against you. You could ask him, "Why don't you get on my side to fight diabetes instead of joining the evil diabetes side."
Smiling and nodding is easier and completely understandable. And not without honor! Expressing your true feelings is harder but potentially more rewarding. I understand both choices!