After a horrendous evening, complete with the kicking over of LEGO Star Wars droids, some smacking of sibling, and the odd “piss off, I hate you”, also at sibling, I calmed down enough to get my wits about me and recall that oldest one does shit like this when he is upset about something at school.
So I asked.
And got “Nothing, I just hate school and it’s stupid and I don’t see any point in going to learn stuff I’m never going to use.”
Which generally indicates he has either a) been ridiculed in front of the class by a teacher or b) had a falling out with a friend.
I can determine which