*Edit: per the example I gave of my daughter's classmate below, this boy is not doing "unsafe" things for the rest of the class. But, He is causing a DAILY DISRUPTION, to the class. And it is enough of a problem, that it has to be handled... by the Teacher and the school. BECAUSE also, the other students/parents are complaining, as well. It is affecting the classroom learning quality and time.
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I don't know what... your son's Teacher told her class.
But...
1) ALL kids KNOW... which kids cause trouble or not. Some kids cause trouble, daily. Kids KNOW this... and they also may go home and tell their parents. Each time there is trouble, it impedes the class lessons etc.
2) Your son's Teacher speaks to you, that is what they are supposed to do.
She may or may not be "targeting" your son. Meaning: IF your son repetitiously causes disruption in his class, the of course... then Teacher needs to handle it. She seems to be trying. THUS, it may SEEM like she is "targeting" your son, but that this is occurring DAILY because your son has issues. THUS, it is either that, the Teacher is being proactive.... and handling things and within her class because it causes a disruption for the OTHER classmates too... or, she is, "singling" out your son.
So the discernment... needs to be, gauged.
My daughter, has a classmate like that. EVERYDAY... he causes issues and disruptions and trouble for the class.... and others. So the Teacher, DAILY and ALL day, handles this child/correcting him/disciplining him etc. and yes, get sent to the office. The boy, does not improve. Yes, she has told the parents. The parents tell the Teacher to do whatever she needs to do. BECAUSE... the boy, is causing a disturbance within the class and classroom and amidst the OTHER classmates (who also get disturbed by this and complains) YES the Teacher, has HAD to... speak to the ENTIRE class, about it... because, she needs to ALSO convey to her students that: she KNOWS there is a problem ,She KNOWS it is disturbing for others, and she IS trying to handle it... and so that the other classmates parents, are not thinking she is a doormat Teacher who just lets kids cause chaos in her classroom. So, there are MANY things, a Teacher has to address (besides that disruptive student), to her classroom and to all the other kids too.
My daughter's Teacher, ALWAYS talks to her students, about classroom behavior, and if a certain child continually and habitually causes disturbance in the classroom, it is handled.
So, this is what happens, per my daughter's classroom and Teacher... she is in the 5th grade.
Everyday, my daughter comes home and say what "Johnny" did... and how it upsets the other kids. BUT, I trust her Teacher and I KNOW that the Teacher is being proactive, in handling her class/classroom and the disruptions in it.
**NOW: in once instance, ALL of my daughter's Classmates, were really getting upset about this boy continually making trouble in class and disrupting their learning... THUS, the kids ALL were telling the Teacher... it caused such an issue, that the Teacher HAD TO TALK ABOUT IT TO THE ENTIRE class one day. And yes, that boy was there present at the time.
NOW IF your son's Teacher, IS "targeting" your son, then you need to document things... and make a letter to the Teacher/Principal etc.
But, sit down with the Teacher AND Principal... to see what is really going on.
There are ALSO School Counselor's... Which are supposed to help these kids... and the situation.