Last time I checked, animals (wild or domesticated) can't speak. You don't hear monkeys telling each other to go **** themselves. An old man yelling at someone for leeching off of him seems pretty decent to me. Find an old person who doesn't use "racist" language. Show me someone who has never got into a heated argument with a close one, and I will show you someone with no family or friends.Because we strive to be more than wild animals? Because civilized people have certain expectations for decency? Because good people reject this sort of behavior based on principle?