If you name a school district where this happens, I guarantee they'll never be wanting for teachers applying for jobs!
From my knowledge of the subject, parents who b*tch enough get whatever they want.
langage arts teacher - gave kid a C- even tho all her papers and tests sent home were graded with As. Refused to show me her gradebook and wouldn't explain the grade.
art teacher - couldn't prevent 2 bullies from dumping paint all over my kid at lest once a week. Kid removed from class after I marched kid to principal's office day after day with paint all over her.
math teacher - had a "stupid student" poll posted in his classroom every week on which students were encouraged to vote.
When I went to the administration over and over about all this plus the dumbed-down curriculum, they said my kid had a disorganized locker and was being referred for special ed evaluation for disorganization. Oh and of course, because she was being referred for specal ed she'd have to give up her TAG (talented and gifted) reading class, the only class she liked.
Needless to say I was fed up and yanked her out of there - and wish I had done it years before. She's been happy ever since. Talk about a toxic environment ! There were only 2 teachers there that I respected, and both of them wouldn't come right out and say it but both let me know I was not the only parent having lots of problems with the school.