I am not sure what part of arrogant he is. i don't get that when I watch his shows. But different strokes for different folks. I see it as he is doing something that is extremely difficult to do for most folks, and for himself many times. He has to be arrogant to keep himself believing that he can actually do it. I.e. the shows where he tries to duck hunt or grouse hunt with a long bow.
I didn't know he had the illness and wish him all the best to be arrogant with those illnesses as well.