For some reason some people think they can just be as rude as they want to be online. It’s as if they believe they are dealing with machines and don’t feel that they need to be courteous in any way. People run the machines, and they do have feelings. Because they are working in ‘service’ does not mean they are sub-human.
There are several forms of abuse such as those that will just come in and tell you how to do your job or that you haven’t done something they expected, even though they don’t have a clue what is going on yet. They come in with a ready-made agenda and will send you a rudely long, tedious list to explain every single detail they could think of, and assuming you will do everything that they have determined will be necessary. This is usually before they even give the training or documentation so much as a peak to see what is necessary and/or what has already