I feel your pain....My husband sounds like yours. I'm sure you laugh inside when you hear suggestions of you both going to classes, or therapy. Mine would never go. "It isn't him that has a problem with your child. It is you".
Ok, enough there. You are the disciplinary, and you have to deal with it now. He is only getting bigger. I too have a 10 yr. old son. He isn't as disrespectful as you are dealing with, YET! If things continue as they are, he will be. He is beginning to talk back, shout, and slam doors. I can see it coming. I have begun talking more with him one on one. Without anybody (brother) around. Talk about anything. Something he likes, his day, whatever. Just talk. Make that a daily duty. After a few days tell him you enjoy talking to him, and you don't like arguing. Stop there. A few days later tell him again how nice it is to talk to him. Let him know that you are always there to hear whatever he needs to say. He may have things going on at school, or it could be Dad that is making him act that way to you. He may need to talk to get out frustrations. I have found it to be very helpful. I know he is 10, but give him a hug when you can. You have got to make a friendship here, as well lay down the law. When you have a friendlier relationship with him, he will respect your rules, and punishment more.
I hope that wasn't too much rambling. I just feel like we are in the same boat. Good Luck, and keep in touch.
P. W.