raised in a barn
Uncouth, uncultured, and oblivious to social manners, graces, or tact. Most often used in the phrase "Were you raised in a barn?" What, were you born in a barn? Wash your hands before dinner!
raised in a barn
brought up to behave like a barnyard animal; having crude behavior. Close the door behind you! Were you raised in a barn? Don't wipe your nose on your sleeve. Were you raised in a barn?