Let's say you taught them how to cook food. Later they come back down to your house and saw you cooking, when they saw the food they said that "you weren't doing it right" because "the french fries wern't brown enough". They they said that "they know that because they know how to cook, and you're supposed to put them in the french fry browner, toaster oven, for a few more minutes to get them golden brown" so "you're cooking them wrong".
Wow! I can't even believe those valley girls said that!