Sometimes.
Well. Mine is.
DS1 is 11 and shares a room with DS2 (PITA 4yo)
DS1 got a Lego millennium falcon for Christmas.
He stored it safely in my room as it was too big for the shelves he has over his bunk bed (which is where he usually keeps things he doesn't want his brother to get)
DS2 tonight has decided to sneak into my room, carry the falcon back to their room and destroy it.
Now I know he's only 4 and just wanted to play. I know he didn't mean to break it.
But he did.
And now I've knelt down to help DS1 clear up the debris and knelt on a piece of fucking Lego and cut my knee 
DS1 is completely not bothered by this and just said poor Chewie lost Han all over again because Han solo was in half 
But argh. I'll be having words tomorrow. He knows he's not meant to be in my room without me. He knows he's not meant to get out of bloody bed unless he needs a wee or something.
I'm not looking forward to it. He can throw.a right tantrum when he wants.
So AIBU to think he's a PITA?
I honestly feel like a shit mum for feeling this way sometimes.