What is the subtle sign someone is from the USA?

I'm an American who somehow picked up casually using the word cunt (probably talking to foreign strangers on the internet). I live in a pretty redneck, white trash area so I don't get a lot of flack. However, if you go around two hours north, where my mom's family lives; it's nothing but small town, Jesus loving, uptight hicks. It's very easy to rub people the wrong way if you don't stick to scripted, SFW conversations and language.

Yeah; the first time I dropped "cunt" up there (justifiably against some idiot that nearly hit my car as he was driving in a parking lot where we were going to a 4th of July celebration), it didn't go over well. I wasn't confronted; but a few of my family members were obviously more upset that I dared call somebody a "Fucking dumb cunt" than the fact that it was actually true and needed to be said

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