I'm sorry, I didn't wake up to impress you.
awesome I am using that next time I get insulted.
Shoot 'em....not socially acceptable, but WTF?!
How about. 'If I want your opinion I'll tell it to you'!
Ask the person to step outside. Averyone know what that mean. When they do, lock the door on them.
Carry on as though nothing has been said.
You are not wrong..then why to get insulted..give them answer back....and if you are wrong.then listen to them..!!!!
use the small end of the ball bat.
turn your back and stand there with your back to them..hehehe
Depends on the situation greatly. Usually a simple "your opinion would mean more to me if it were worth listing to" kind of slap back is appropriate. A variation is "are you really so immature (or unprofessional) to engage in this kind of behavior in this situation?"