Indeed. Itching (not on the skin as in DH), swelling, shortness of breath, hives, eye irritation and a few other symptoms are typical of allergies, not an autoimmune response. Many people with celiac disease also have allergies to certain grains. The fact that you react (which nobody is disputing) does not mean that it is not an allergy that you have in addition to celiac disease.
It seems that some celiacs believe that if it is a reaction that they don't have, it must be allergic. It has been well established that some celiacs are sensitive to lower levels of gluten than others. That could also be a reason why one reacts to something that another doesn't. There are general indicators of allergy as opposed to a celiac reaction that can be discussed with an allergist.