Personally, I appreciate it when anyone asks me if I can eat something or not; it shows respect and consideration. And if 10 other Type 1's were in your office there would probably be 10 different answers to the question of what they can eat. Personally, though I don't think in terms of what I "can" or "cannot" eat. I'm a grown-up and can do whatever I want. But I can also make choices. I choose not to eat certain things for a couple reasons: In the short run I find them hard or near impossible to accurately bolus for, and in the long run I know that eating certain things and taking the insulin to cover them, I can gain weight easily and weight gain can lead to insulin resistance which I need like a hole in the head. But those consequences might be easier for me as a post menopausal woman to see as imminent risks than a younger person would.
Just to contribute my own memorable comments though: My nephew told me a restaurant our family was meeting at and said, "they have great vegetarian pizza for you, Zoe."
Oh yeah and my (highly intelligent) brother when I explained about basal doses being released every 10 minutes or so by my pump asked me if I could feel the needle going in each time. Hell, though, when I heard about an acquaintance who had an insulin pump long before my own diagnosis I formed an image of something looking like a turkey baster somehow attached to her side with a handle for "pumping".