My goodness, that poor child. I hope somebody teaches her better before she's grown.
With that said, any seven year old I met who said rude things to me and then tried the "I'm joking" line would be pretty firmly corrected. I don't believe in that "Don't correct other people's kids" line. If your kids are not within your earshot and reach, then you've effectively said that other adults can step in. And this one is pretty easy: "I think you know that's not a nice thing to say, "joking" or not. I don't want to have to tell your aunt about your behavior, but I will if you continue."
And then if I did have to continue with Lynn I'd emphasize that the child is being disrespectful and, to the manager or whatever, that the child is being disruptive.
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With that said, any seven year old I met who said rude things to me and then tried the "I'm joking" line would be pretty firmly corrected. I don't believe in that "Don't correct other people's kids" line. If your kids are not within your earshot and reach, then you've effectively said that other adults can step in. And this one is pretty easy: "I think you know that's not a nice thing to say, "joking" or not. I don't want to have to tell your aunt about your behavior, but I will if you continue."
And then if I did have to continue with Lynn I'd emphasize that the child is being disrespectful and, to the manager or whatever, that the child is being disruptive.