It sounds like your family and their friends are trying to be helpful by removing possible sources of temptation from you, based on the belief that since you have diabetes you either (1) crave sugar as an addict does his fix, and/or (2) will die if you so much as inhale a single sugar molecule. (Obviously a misunderstanding, but a very common one.)
Removing all temptations to misbehave is an understandable reaction from anyone who has made – or even moreso someone who tried to make (but failed at making) – a major lifestyle change… You may need to prove to your family that you do not need that level of “support” from them. (Or, could it be that they are trying to prove to you that they are now eating “cleaner” in order to try to avoid developing diabetes themselves?)
I have tended to be the “wet blanket” because I need to watch my sodium as well as everything else… and I’ve found the most effective way to handle everything is to try to stick to a “whole foods” diet to the greatest degree possible. I would much rather treat a low with OJ or raisins than with a Coke or a candy bar, and then after I know my blood glucose level is climbing back to (or beyond) normal, follow it up with some nuts or a reduced-fat string cheese to blunt the fall-off. I’m the one who keeps the house stocked with fresh fruits, fresh veggies, and whole-grain flours… I’m the one who makes the “sign against evil” when confronted with White Flour, High Fructose Corn Syrup, and Partially Hydrogenated Vegetable Oil…
Fortunately, a lot of the family food arguments subsided after my diagnosis, because I can throw the “health” issue back at them.