Carob is awesome! I like it much better than chocolate. But, it's not chocolate, and food made with carob is not chocolate, it's carob. Is there some overall

Carob is awesome! I like it much better than chocolate. But, it's not chocolate, and food made with carob is not chocolate, it's carob. Is there some overall reason to call things something they are not? Is this another form of meme illiteracy?