I am generally really chilled, patient and well mannered. I open/hold doors for people and help people and don't lose my temper. But in the gym if someone is a dick I am really bad. You get loads of guys over here using multiple machines but chatting on the phone or walking off to chat to people. It happens anywhere but over here for some reason it is really common (everyday). I just use the machine and throw their towel on the next piece of equipment. Most of the time I can't speak their language but they get the point.
Some of the personal trainers can be bad too. I was leg pressing the other week (just got on) and he comes over and says can you get off as he wants to use it. I later realize he isn't even training him properly and they are more chatting to eachother whilst the guy trains. I have seen a few of them do it to girls and the girls will get off and use something else. I would usually be polite but both of them are complete dicks so I just said he can work in with me but I am going heavy and he won't be able to lift it so no point.
I have seen guys leave their towels on equipment for most of my workout (an hour) whilst they chat to their mates. The worst is when I say to people work in with me and they say no and just stand there staring at me for ages until I am done. Plus these are not guys being aggressive they just don't have a clue.