Shirt etiquette?

Having be raised in Europe, I learned that one should always be dressed properly in public and that one never wears a hat indoors. After living in the States for 62 years, it still makes my toes curl when I go to a restaurant, and I see guys, wearing baseball caps, shoveling food into their

When I see men who don't remove their baseball caps inside magnificent cathedrals, it's difficult not to punch 'em in the face. They either don't know how disrespectful it is or they don't care.