(one) didn't just fall off the turnip truck
One is not some awkward, naïve, or unsophisticated bumpkin, as is being suggested or implied. A: "OK, just be sure not to make lewd remarks like that during the dinner party." B: "Hey, I know how to act around decent folk! I didn't just fall off the turnip truck, you know." You're wearing jeans to a fancy event—good luck convincing the boss that you didn't just fall off the turnip truck. I may have grown up in a small town, but I didn't just fall off the turnip truck—I actually went to college in New York City.
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