What IS the point?

I was scolding Evangeline in the car the other day, Adam chimed in to add in his two cents, and Evan cut him off before he could even finish, "HeLLO-OH?! That's not the point dad!" I told her she could not talk to her dad that way, but I should have been more stern with her. I could barely keep a straight face though, I mean, where does she pick this stuff up? She's only 3! I can't even remember what I was lecturing her about to start with. My God, what will she be like when she's 15? Sassy girl!