Explain santa not coming?

We will not be teaching our kids anything about "good" girls or "bad" boys or anything like that. We use good as a descriptor for the dog but never as a description of our kids. We tell Sparky that she's a nice girl and is kind. She has a couple kids that she sees often and she'll describe them or their actions as naughty. That's our basic reference point. See someone else do something undesirable and then remind her how we want her to behave and treat others. So far, so good. Er... um.... so far, so nice.