no this is not rude
Obnoxious
it is slang for a girl.
Yes
It is a rude name to call someone; it is basically calling someone a hoe or whore.
No
A stubrag is a REALLY rude way of calling someone an idiot. Please don't call anyone that, it's really rude!
Chick or a fledgling
Depends on what definition you'd use for it. Generally it means a young girl.
Yes.
yes it is rude
Sometimes, when someone gets on your nerves, you call them a rude name. That is sometimes called a joke.
It doesn't call them rude but it does somewhat criticize them. Psalm 14:1 says: The fool says in his heart, "There is no God." So the bible doesn't call them rude but it does call them foolish. Even though the Bible doesn't call them that; still it is a rudeness, not to recognize the one who created you, as even existing. It's as if someone gave you an expensive gift, and you claim they didn't even exist. It's not just silly; it's just plain rude.