My ds went through a HORRIBLE phase at a similar age and I was dreading the teenage years.
He argued with his siblings, acted as if DH and I were the most awful parents on earth and basically couldn't stand being around us.
Every question we asked him was answered with 'urrghhh'.
It feels awful doesn't it. 
WE tried really hard to remember how tough it is to be that age, and made sure that he got special 'older child' priveleges like staying up with just mum and dad for a bit later or going out for coffee with 1 parent, in return for extra responsibilities, including being a reasonable person! He really seemed to rise to the challenge, and treating him as a more mature person resulted in him behaving like one.
We still had days when something tiny would seem like the end of the world, but we just tried to keep a sense of humour about it all, and remember that it was JUST A PHASE!!! ( that has been pretty much my whole parenting strategy 
)
Ds1 turned 13 earlier this year, and almost overnight turned into a lovely, polite, helpful mature young man! I think, for us (so far) pre-teen was worse than teen. It does get better OP, it is just his age, not who he will be forever!