HELP!!!!

Okay, I have a question for all you mommies with children young and old. Even if I don't know you, feel free to chime in your opinion. I AM DESPERATE.

My son has a very hard time a lot of the time being respectful to adults, whether it's his parents or teachers, aunts/uncles (Morgan, I know you can vouch for this), etc.

I feel like we have tried everything and am now at the point where I am tempted to cancel his birthday party to let him know we are serious about his behavior.

What I'd like to know is what you all think about this type of punishment. Is it fair for us to take away his party?

Please help.