I realise it's a phase (god, I fucking hope it's a phase) but it is getting me down as we argue all the time about everything!
He doesn't want to do anything, ever. So any suggestion or comment is met with sulking, backchat, grumps.
Then, he will ask a question about something I've mentioned, and when I explain, he will say he hasn't understood (in a "that sounds totally stupid and implausible" way), so I explain again, and he'll again say he hasn't understood and it makes no sense...etc. He is a bright child and often asks about quite complex matters which he has no problem understanding, yet simple things like "why are we getting a freezer for downstairs" - "so I can bulk buy meat and fruit etc directly from the farm and freeze it" (this morning's example, as I'm staying in waiting for delivery of said freezer) are met with utter incredulity and requests for more explaination. I can SEE he's doing it deliberately, and I shouldn't let it wind me up, but it does.
He is also very hostile and rude when it comes to homework (an ongoing battle tbh but it's reached fever pitch) - anything I say will be met with arguments, discussions, downright refusal. So it could be something simple like me pointing out he needs to use the ruler to underline stuff, or him not understanding long division and me trying to explain it to him - and off he goes, half an hour of arguing, rude comments, snorting derisively etc etc.
Due to his school being totally useless and homework actually being very important (we are in Germany), he needs to get it right and understand what he's doing - it's his last year before high school in september. So just backing off isn't an option.
But it's not just homework, it really is everything. I'm so sick and tired of it, it's utterly draining. Any advice would be gratefully received before I implode with frustration.