I used to teach Yr 10 and 11 kids who never brought a pen. Or a school bag. Not a case of forgetting a pen, just can't be arsed as they can just borrow one.
Our iso room was for more serious incidents like racism, threatening a teacher (a kid said leaned in a told me he'd break my arm, when I was pregnant).
But the low level stuff was the worst. 10 kids haven't brought a pen, 5 have forgotten their book. 3 were off last week so have no idea what we are doing. That's just the start of the lesson.
Then you are trying to help someone/get feedback, but a few are whispering, breaking a pencil into a million pieces, calling out so you are expected to listen to 10 kids all at once.
On and on. And when they don't make progress it's all my fault.