I feel for you so much.
Could there be something that is making him behave this way? bullying, not challenged enough etc (I know you will have been over and over this in your mind, probably several times). Do you know what opinion the other parents have of the teacher? Silly noises on the carpet is a bit much really, but maybe if they think he is worth bothering with they are trying to pull him up on minor things before it escalates? When DS1 was on his behaviour book he got into trouble for all sorts of trivial things (when I know for a fact there are kids in his class that do far worse things).
My DS1(now nearly 11) has been full circle - reluctant, bullied, class clown, seriously daft behaviour, behaviour book, aggressive, back to being bullied. via school nurse referral he has been diagnosed as having anxiety and sadly is back to being bullied again. It seems we made the mistake of bringing DS up to be an individual with his own opinions - this is not necessarily a good thing according to our HT. Our school (this is not an observation of ALL schools - I don't want to get it in the neck) seems to find bright children difficult. My BFs boy is on the national gifted children register since he went to secondary school, but our primary said he had "social problems", she, I and DH all see similarities between him and DS.
If you ask DS about what has happened what does he say? How does he react if he goes to friends houses to play without you?
It is almost half term, it might be a short lived phase? (I live in hope)
Please please hang in there, I spend a lot of my time telling myself this, reminding myself that the attitude I get at home is a reaction to the bullying. A bottle of wine every now and then won't hurt.
You sound like it is important to you, that is half the battle - you haven't given up and you care about your DS and his wellbeing, there are a lot of parents out there who wouldn't bother.
I am sorry I have no practical advice, but I will watch his thread and will be here if you need to sound off. I hope you haven't found my comments offensive. I have been where you are now and it's difficult. I really wish I had a solution.