Starlight As a mum and a teacher, and as someone who is friends with non-teachers and teachers, I do see both sides of the question. Sorry this is so long, but been thinking about it all a lot lately, and you raise some interesting points which I'd like to address.
Teachers also want a good relationship with parents, believe it or not! They worry about Parents' Evenings, and they fret about having to tell parents about their children as they never know how people are going to react. They may come across as aggressive/defensive as they are anxious and wondering if yet again this is a parent who is going to start swearing and shouting or throwing chairs about (both happened to friends of mine, and in both cases where a child had been fairly told off and yet the parent still objected violently.) Plus as you yourself pointed out they get a lot of criticism all round.
And although I think that yes there should be standard professionalism as far as possible, teachers are humans, not robots. There will be variations, just as you'd find across doctors, police, and any other profession. To expect otherwise may be the "ideal scene" but is somewhat unrealistic - in any area of life.
I agree teachers should listen, of course. But I don't think it's actually listening that is the problem. It's agreeing. The majority of teachers are also parents, but the majority of parents have never taught a class and so it's hard for them to really empathise with what it's like to be considering 30 children all at once, not just one or two. Sometimes what the parents feel/know their child needs, or even what an Ed Psych suggests, just can't be done, whether for time, money, or lack of staff. Or, not without neglecting the other 29 children and upsetting their parents.
To give you an analogy, imagine if you had an injury which you had researched and understood really well. Would you go to a surgeon and tell him precisely how to operate on it, step by step? You'd surely more expect him to listen to you and then work out what he could realistically do to help? Unless you had also been trained for years and had the same experience, you wouldn't know all the things he needed to consider no matter how well you understood your own injury. Teaching is a bit like that. No they don't know your child like you do (or probably the need they have either) BUT they have years of experience in a classroom and will have known hundreds of children - sometimes (not always!) they do know what they are doing and that some things sadly cannot be achieved in a school setting. You say they expect you to be "humble" - no, but just as you want them to acknowledge/respect your (undeniable) superior expertise over your particular child, they want acknowledgement/respect of where they have more expertise than you.
HOWEVER all that said, I am fully aware that, just as not all parents will throw chairs or refuse to accept their child is not top of the class, not all teachers do as they should. And not all of them will know what they are doing either, and it must be absolutely maddening to deal with them. I'm also sure some are arrogant, really just don't listen, or communicate really badly (they get no training in parent relationships by the way!), or maybe don't even care, and (as in any profession I guess) the bad experiences seem to give the rest of us a bad name. I've certainly spent a lot of my free time lately helping other parent friends to sort out issues with their children and schools, especially with regard to SEND. And FWIW I'm not thrilled with my own DD's teacher right now either!!
I have thought a lot about what the solution is too as I see all these news articles and read things on MN and worry - I don't honestly know. I guess better training, and also probably incentives to attract more and more top calibre people into the profession, so that there is a better chance they will deliver the service they should. I also think it would benefit parents to understand more of what schools are trying to achieve, since I think the communication (from the school's end) is all too often vague or misleading and thus leads to more problems. And yes, I think the schools should be addressing that one rather than the parents. State schools though have their hands well and truly tied by government policy, so maybe we should all campaign there! I've been told recently that most people in educational policy have no education experience, so maybe that needs to change too?
And finally, I didn't actually think there was a "them and us" mentality either until I joined Mumsnet (since I've always worked closely with the parents I've known). At which point, I've discovered a fairly constant stream of criticism regarding teachers even where I have been doing my best to help and support parents where I agree their particular school has not done as they should, as in this OP's case. Once again I am very sorry to hear that you have all faced so many problems. I hope that maybe I have given you a bit more insight into what might be going on in teachers' heads to help you get what you need from them, or if not then I hope you can at least see that some of us DO care, and some of us work very very hard to ensure children and parents are both happy. I personally love helping people - it was why I started to teach in the first place, partly why I joined MN, and why I commented on this thread at all.
Anyway I shall bow out now and leave you ladies to it. I wish you all a successful resolution with your respective schools, and better times and teacher experiences in the future!