I agree with you that diabetes has variation and I'm glad you found a way to manage it that works for you, however, It's their group. They have the right to be as inclusive as they see fit. Your way of managing does't fall in line with theirs.
I'm really sorry you felt they were being rude, I really wish it wasn't so and I do not agree with it.
I'm glad there are other groups and forums out there as well, like this one. There's a reason I'm a part of many groups outside of the Typeonegrit one, as I like seeing and hearing from all types of people and different ways of managing diabetes, even if I don't always agree, there are so many people here with years of experience, I like to take it all in then pick and choose what might work best for me and my lifestyle.
By the way, even Dr B himself does't deny that people are different and that if something works for you, then by all means, stick to it. He's just a very analytical person who likes to see the numbers. He does say that his guidelines are just that, guidelines, and agrees that different people will find variations that work best for them. Just the other day a mom in the group mentioned how some foods from the approved Dr B's list spike her son's BG levels, while there are some foods from his No No list that her son can have in small amounts. Just goes to show how it's all a matter of trial and error for all of us.
In any way, I'm grateful for all online groups and forums for people with diabetes. Not to get too emotional here, but I appreciate all of you, despite some of our differences, we have more in common after all, and we should always have each other's backs.