Really glad that the school does not take your approach.
I'm not quite sure what approach you mean. I was not suggesting that children who habitually cause low-level disruption are, or should be, removed from my classroom, and they never are, but they do ave an impact.
Look at it this way. All groups of children, all individual children, make demands on teachers' time, and to that extent have an impact either in the classroom or at other points in a teacher's life.
For example a vulnerable or neglected child might take no additional time in lessons, but will require a very significant amount of time in terms of documentation, meetings etc outside lesson time. This has an indirect impact because a teacher therefore has less time to e.g. finely tune plans and resources for the class for the following day / week.
A child who specifically struggles, or who is particularly gifted, in one of more subjects, takes time both in the classroom and out of the classroom - extra planning, interventions at break, lunch, assembly times, allocated TA / teacher time during lessons that cannot therefore be allocated elsewhere.
Children who misbehave occasionally but at a high level - e.g. those who throw chairs, are actively unkind - take time: if they have a particular SEN, lots of extra time in meetings as well as dealing with behaviour, if not, simply lots of time dealing with the behaviour and its consequences.
Children who misbehave at a low level but high frequency also take time - lots of little bits of time, which are very visible to the remainder of the class.
My point was that ALL these groups take time (apologies if I wasn't clear). I had understood Candy to be saying that all the groups EXCEPT low level disruption took time, which isn't accurate.
I suppose I'm trying to imagine myself in Candy's DS's teacher's place, and what I could be saying to Candy and what it MIGHT mean in actual terms. Candy's interpretation of it may be absolutely accurate - minor verbal warnings 1 or 2x per day. But it COULD be very different (multiple warnings each hour, but improving over time and definitely better than reception) with what the teacher is saying being exactly the same IYSWIM? In Candy's place, I'd be going in to see the teacher with a 'in comparison to age expectations and the rest of the class, how is DS behaving, and when you speak of verbal reminders, how often and how many?'
All this is making me think very carefully about how I communicate with the parents of my 'low level disrupters through silliness', and what their picture of behaviour might be vs reality - thank you.