Savana is very rude to dbf but it has gotten better. She does it to me sometimes and I try to be cool if I know she is just overtired or really upset. But there was a period of time where it was out of hand and we made a rule that any sass talk earned 2 minutes in her bedroom. She stopped relatively quickly after that.
OMG
I feel strict!
Kai is also really rude but I handle him differently because he doesn't respond at all to timeouts. I will just model for him how he needs to speak to me. That usually results in him screaming "FIIINE!!!" and then saying it kindly -ish.

He's a trip. But then I tell him thank you because at least he's trying.