My 12yo spends all available time in bed, pants and oodie on, curtains closed, door shut. He emerges for food, which (unless I intercept him) he takes back to his room and secrets in his nest.
He will also emerge happily for football practice/matches but usually returns in a foul mood and slanders his team mates, the opposition, his coach and the referee until we tell him to be quiet. He comes back from football utterly filthy but will quite happily hop straight back into bed unless I frog-march him to the shower.
On the other hand, he insists on having a shower before leaving the house for any reason. He comes out after an unreasonably long time and flings the wet towel onto his bedroom floordrobe (where it would stay forever if I left him to it) before prancing into my bedroom dressed only in pants to preen in the mirror. He has his own...
His room smells of damp dog (we don't have pets) so I air it when he's out. I stand in his room every evening and make put his collection of apple cores, orange peel, grape stalks and sweet wrappers in the bin and put his collection of dirty crockery in the dishwasher. I confiscate his devices overnight, which earns me a scowl.
He does his own washing, usually at 10pm (bedtime's at 9.30) when he realises he doesn't have any shirts/pants/PE kit for the next day. He then sets his alarm for 6am, waking everyone in the house, goes straight back to sleep and has to be bullied out of bed before his friends arrive to walk to school together.
He barely tolerates 10yo DD's existence but will be nice to her if strictly supervised. His conversations with me and DH are generally limited to money-making schemes, lectures on the evils of money (often in the same conversation), moaning about football/friends/sister/homework and asking for money/snacks/extra time on his Switch.
OTOH, he's doing well at school, unloads the dishwasher every day with minimal fuss, tells me he loves me when he says goodnight and sometimes lets me give him a cuddle. I love him to bits and hold out hope that he'll grow out of this stage and morph into a decent human being.