What do you tell someone who has got a nerve?

Question

When a younger guy is talking to you and he's not being polite enough,while he should be,what do you tell him?(things rather than''whatch your language,keep a civil toungue in your head,look/mind who you're talking to.etc'') . I wanna tell him not to have such a nerve

Answer 1

you can say:

your parents must be so disappointed in you

or

i can see why you don't have any friends

or

you are very rude

Answer 2

Say, "Excuse me. Does your mother know you speak this way?" Say it politely and not sharply. If he is really a good guy with an overzealous mouth, he will be embarassed and you will have achieved your objective.
Otherwise, study a copy of the Dictionary of Depraved English
and fire away.