It seems like the real question is what "proper" means.The strange thing is that's hard to get a consensus on, too. Consider the example presented previously that it would be improper to use "ain't" in a formal situation. Well, if it's improper in a situation, it can't be proper English, can it?At the same time, there are people who will insist it is improper to use the correct names for certain body parts around children, preferring that slang terms be used instead. Does that make the correct names improper English?So that's apparently not the way to determine what proper English is, huh? hehe. It's really no wonder the world is a mess.