This is a very interesting post, and contains many distubing comments. I really would have thought the "Agriculture Community" to be better informed, and not so ill tempered.
First, I am not a Teacher, but I have been a School Board member. However, my wife has been in Public Education for 24 years, the last 19 as a Guidance Counselor. She believes the primary problem with education today is "Entitlement"; that parents feel they are entitled to Do and Say whatever they want, whenever they want, and to whomever they want. And, to make matters worse, these parents are raising their children with that same belief - "I don't have to come to class"," I don't have to do Homework", "I can too wear this, my Mom gave it to me", "You can't take my Cell Phone". "You can't tell me what to do". The list goes on and on. If you disagree, you haven't been in the halls of a Jr. or Sr. High lately. There is zero respect for authority, plus Alcohol, Drugs and Sex are rampant. The students act exactly the way they do at home. In an average class of 100, the top 10% are the kids without parent issues, and things fall apart rapidly from there.
As to protocol, most public schools are the same. If a Student has an issue, the parent schedules an appointment after school with the Teacher. If they cannot reach resolution, an appointment is scheduled with the Principal. If still no resolve, an appointment with the Superintendent. Rarely does this ever happen. If a parent wishes an audience with the School Board, they must file to appear on the agenda of an upcoming Board Meeting. This almost never happens, because the Board can stall for months by having a full agenda.
Now, about the teachers. #1, they are all under paid and over worked. They have a job to teach a room full of kids with only a few who care anything about anything. Teachers also get extremely frustrated by all the "Activities" which take students out of their classes. When do you think the Teacher finds time to update each of these AWOL student? After school, when they are NOT getting any extra pay! I'm sure they take it personal when any activity interferes with their class. Wouldn't you? LLBUX is correct that the Ag Teacher is to blame in the case of this Science Teacher's displeasure. The Student should NEVER have to notify a teacher about a school activity. All of those absences should already be on the School Calendar.
Neither Parents nor Students are entitled to anything except a good education. That's all most Teachers and Administrators are trying their best to do. Most often, it's a thankless task. Give 'em a break!