K.B.
I have to be honest here. No, I do not think this is something that should be taught in schools. This is something the parents need to own up to and teach their children, themselves! Too many things are being relied on "oh-they will learn that in school"...And too many parents are not raising their children, and relying on the schools to do it for them.
Teachers have a lot of their plates already and do not need to be held responsible for the manners of the children, too. Many parents will get angry with you if you correct their child by making them say excuse me, please and more. This is just another liability for the teachers, to be honest.
In today's society too much emphasis has been put on "its the teacher/schools fault" I see more parents who are UPSET that it's summer vacation, or their child had a week off school, instead of happy that they get to spend time with their own children! I see "parties" by parents that school is finally in session, and they got to "get rid" of their kids. I see more parents who are distraught that the teacher/school wants them to be involved in the classroom. And I see more parents who are more than happy to drop the child off at school, don't really care what they did or how they are, just to shuffle them to MANY activities that they do not personally participate in (sit on side lines and chit chat), just to rush them through dinner on the run and scooch off to bed or to do their homework, and then blame the teacher/school for the child misbehaving.
This is something that adults need to parent to their children. I know I have! I agree more adults need to have manners, but remember, children will reflect what they see. They see YOU use manners, they are apt to do the same.
So in short, NO! this is not the responsibility of the schools, this is the responsibility of the parent!!