I have read the entire thread and it is all quite fascinating. I am a teacher and, in the past decade have taught all year groups from Reception to Year 7.
I can't recall ANY parents that I hated in that time. I can recall parents who, on occasion, made my life harder in many of the ways already listed, such as: not supporting school rules, times, processes etc.
Then there are the parents who, on being asked to come in to see me, get defensive and that may lead to anger. I feel I am a very calm person and the only parent I did have to stop myself from 'debating' with was fairly recently when she asked me how I expected her to get her son's (Y6) homework done and why do teachers have such unreasonable expectations of single parents (her words) and obviously teachers don't have children and housework and other stuff to do or they would not set (a 20 minute) task once a week!
Now, though, I get to see it all from the other side of the fence. DD1 is 3.10 so has another year of pre-school still to do before starting Reception. She already knows her alphabet and most single sounds, can use her fingers for simple addition and subtraction and has lots of sight words (so can 'spot' PLAY in any context because she sees it so much on the cbeebies website!)
Where she has picked all these - and other - bits of knowledge up I don't know! Obviously she learns through play and does it a lot. She is fascinated with the world around her and is generally a chatty, friendly little girl. I get called in to speak to her keyworker once a term, as with all other parents, and although it is nice to look at the pictures and browse through her observations and stuff, I simply send her there because she loves going and is happy there! That's what I write in my feedback box too.
We spend our time at the beach, or watching ants or bees or beetles, sharing books, tipping toys all over the floor and having fun.
The big thing that I think links to parents wanting to speak to the teacher all the time and ask how their DC is doing is because, until the child starts school I think you get to know what they do all day - as soon as they start school it quickly moves to the:
Parent: How was school today?
DC: Fine.
Parent: What did you do?
DC: Nothing
and that can be hard for us parents!