I hate co-workers that have a problem with something you are doing and instead of doing the mature thing and talking with you about it directly, they go straight snitching to the boss. That really burns me up!! Tattletales are for kindergarten kids!!
I am a subsitute teacher and I hate it when the administration gives lots of applause to the athletic teams and none to the kids that are doing well academically. I mean, the football, basketball, baseball and track teams get a big dinner while the honor roll students get about 5 funky little minutes at the end of the assembly program at school.
Co-workers who have a double standard b/c of your status. Example: I used to be a medical secretary. On my shift, my immediate supervisor is the charge nurse. We BOTH are supposed to follow the same rules on the floor in regards to phone and internet use during down time: no more than 10 minutes on the phone and 20 on the internet, no chatting or shopping. Well, why is it that it's cool for the charge nurse to sit on the phone for hours on end talking to her hubby and ordering baby stuff on the internet and reading magazines on downtime, but I get wrote up for using that SAME time to study for a class or to talk to my husband and son for two minutes to see how they are??
Bosses who do not support their staff. My old boss at the hospital would not say anything to the doctors that would verbally abuse the staff. She was too busy being their boot-licker that she would let us suffer so that she can get some recognition with the docs.