There've been a lot for me. Fortunately, less crap ones than nice, but still...
One that springs to mind was a git that was supposedly supporting in my classroom and then reported me, when I told off a boy who was picking on a refugee girl in the class. Had to go and see the head teacher about that. All because the git was aiming to make a name for himself in the school. He was gone within a year.
Another was my head of department who took offence because I was given an A Level class instead of her. I had no choice in my timetable. But she took offense at it and tried to turn the whole department against me.
Finally (I could go on much longer but won't) was a colleague that I thought was a friend. But her way of promoting herself was by putting others down, back stabbing and being underhand about everyone in the department, including me. She was unable to praise another colleague who had an awful year at work but who still triumphed with excellent GCSE results.
Who were YOUR shit colleagues?