That sounds really frustrating! I have a 9YO who pulls some of the same things and can just as exasperating.
Have you considered that with several other children in the house, this may be the only tried and true method he's found to garner your attention? Kids crave it and the more children in a household the more they seem to need. I've found this age especially challenging in the regard with my own son as he's reaching out more to his peer group, but still needs the security of home and reassurance that it's ok to break away. It's an including confusing and demanding season of life for both parent and child I've found due to the continued childlike nature but the desire and pressure to be more mature. of course....what season of life isn't demanding? :)
Something that has worked for us are individual dates with the child. Before our third child was born, my DH and I set aside scheduled dates each week with each child - alone. We allow the child to choose the activity based on time and budget and then follow their lead, working to remain present - no cell, no extraneous conversation, etc. It worked miracles for my son and his attitude, ability to cope, grades, etc improved dramatically after three or four weeks - once he saw we were committed and he felt secure in our love. If you picture their lives running on love and security as fuel, with a little tank inside to hold it (like a car), how is your son's love tank? Optimal performance occurs only when the tank is full and he may be running on a debt at this point... Since our third child, we've had to scale back the dates to every other week and you may want to consider starting at once a month. It may look like your husband takes him out one night and you take him out two weeks later, or both of you in the same week.....I would try that immediately tho. It may take quite awhile before he trusts the relationship enough to start opening up though.
I would suggest perhaps some of your language is reinforcing the problem though. For instance, he's not lazy, he's making lazy choices. If you say he's lazy it's attacking and degrading, as well as taking away his opportunity to own the responsibility. If you say he's making lazy choices, it reinforces the truth that he has the ability to do it right and is choosing not to, throwing the responsibility back on him. Also, whether or not you've said it to him, you've stated your son "can't do anything right." I would suggest that is false and there are things he does perfectly well. By saying it however, you're reinforcing the lie you feel, creating further contempt and anger toward your son, which he gets. You may not have said this to him, but he understands undoubtedly that you feel he can't do anything right and probably feels rejected and unloved by that. Oftentimes this is translated into a "why bother?" attitude by the child who gives up on the parent he feels is rejecting him and thus refuses to perform in any manner, but especially areas said parent finds important. Try differentiating between your child, whom you love, and his undesirable choices. address the choices and reinforce he has the ability to make good ones, and coach him in how to do that within the household rules. It helped us a lot.
Good luck!
Good luck!