Self-Righteous

I've been trying a new technique with the kids lately. I've been trying to talk a lot less than I'm used to. If Kaeley wants to argue with me I answer in one of the five statements that I learned from "Loving Your Kids on Purpose": I don't know. I know. Maybe so. Probably so. Nice try. It's been funny watching Kaeley's expression. She'll stop her bickering, look sideways at me with a look of skepticism, and lately she's been snickering a little. It's not her favorite thing, and I've had to temper her disrespect a bit, but on the whole it's been in the positive.
Yesterday she grabbed something right out of Nathan's hand. I grabbed her hand and didn't know what to say other than my usual, "Blah. Blah. Blah!" I stared at her while I held her hand. I finally asked her, "What do you think about that?" She stared back at me and tried to play the "What are you talking about, Mommy?" She finally sighed and said sadly, "It was pretty self-righteous."
I was so taken aback by her answer, because I don't go around saying she's self-righteous, that after locking eyes for a few seconds I couldn't help but start laughing!
Where does she get this stuff?