So, My mum always said preteens were much more confrontational than teens and that for me she found it the hardest stage because your hormonal and moody but still have to sort of wear kid gloves with them, not to the no nonsense approach you take with teenagers, (i was a very early developer so probably hit the worst hormonally then)
I didn't believe but my 12 yr old DS, dear me 
Moody, snappy, sullen, a bit withdrawn everything is answered "Fine!", hes an early developer too, more so than his mates which must be quite isolating.
then next minute back to his normal self, i find Mardy, Sulkiness harder to deal with then outright rudeness, i. e teens swearing etc, i looking forward to him coming back, 
Anyone experienced this? does it get better?