L.A.
Remember when your child went through whining?
Treat sass talk and prissy talk the same way.
"I do not understand you when you use that tone of voice."
"I need to you to ask in a better tone this time."
" My answer to you any time you use that tone will be NO."
"You need to go to your room and look for your regular voice."
"I was not asking you a question, I was telling you what you need to go and do."
Hang in there. this can become a bad habit, if you do not nip it in the bud..