Assholes who attend a meeting, are given every chance to contribute, including being asked point blank, then bitch the rest of the day that no one wants their input.
Dickweeds who make suggestions for major structural add-ons on construction projects during the final walk through, rather than while we are settling the scope of the engineering of the project. They were part of the team who set the scope. Then they complain that no one wants to hear their ideas.
People who leave their dishes in the break room sink for someone else to clean up. Bitch, neither your mom nor the dish fairy work here. Clean your shit up. Shit-canning their dishes works to get this point across.
ETA - If you are a wastewater operator and you show up to work in a white shirt, thinking that I'll assign you to a desk task so that you stay shiny and clean, best believe that you are fixing to get dirty cleaning out a pump or dewatering sludge.