The main issue is likely that he really doesn't want to be there.
Me and my Mum were always really close, but for the year I moved back home after university we clashed massively.
I'd tasted freedom, and I didn't want to be back living in that situation.
I wanted to be able to go on a night out and not know where it was going to take me, and not have to worry whether she'd cooked dinner, or suddenly realise that it was 2am and feel guilty that I hadn't text her.
Or I didn't want to feel judged that I was still in bed with a hangover at midday on Saturday (I doubt she cared, but I felt judged anyway.)
I wanted to be able to bring a girl back, but there was no way I was admitting I still lived at home
It's really constraining living back in the family home after spending 3 years striking out on my own. So yes, I spent as much time out of the house as I could, and I sometimes snapped at the "Where have you been?"s, because to me it was keeping tabs on me, whereas my Mum was probably just trying to make conversation. And my Mum would get annoyed because she'd have to get my clothes out of my room to wash, whereas I was keeping them in a pile in the corner because I was going to put a wash on over the weekend, and no matter how many times I told her this she'd still go in my room to get them and then be annoyed about it.
The moment I left home again our relationship improved hugely.