Something being widespread in a community doesn't mean that it's tolerated by everyone in that community. Milk is common in central Europe, but some people are intolerant to lactose. Tomatoes and red wine are also common, but some people can't have them due to histamine intolerance.
(I also have a central European colleague who has actual celiac disease. That said, I agree that the general gluten panic is way overblown.)
(I also have a central European colleague who has actual celiac disease. That said, I agree that the general gluten panic is way overblown.)