Oh, do I empathize with you! ARGH Here are some ideas for you...

1. Whenever he asks you a question, ask him what HE thinks and when he starts to tell you, tell HIM "No..."

2. When he starts telling you what he thinks the answer should be, ask him "If you already know the answer, why did you ask me?"

3. Or... "You know, Son, it's really bad manners and a total lack of respect for me for you to do what you're doing. It upsets me very much and I'm just going to walk away when you start." Then follow up.

4. Just say "SHUT UP AND LET ME FINISH!!!" Nah... just kidding, but I sure would be tempted!

Sabrina, I have a 27 yr old that never learned the meaning of respect for ME because of "positive reinforcement." Do what you can to teach that boy some respect, ok? You've still got time.