The one person you just can't stand at work!

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I work with nothing but girls. Most of them are younger than me, a few my own age, and few that are a couple years older than me. In particular there is one girl I just can't stand. She thinks she is better than everyone else, and is convinced that no one else can do their job as well as she does. She is constantly complaining about other people and whining about how bad her job is and how she has to do everyone else's jobs. Lately, she has really gotten on my nerves, and then last Friday, she came in and bit my head off, screaming that I didn't do this or that, and I wasn't doing my job. I started to yell back, and then just decided that she isn't worth my time. This morning I made sure that all my stuff was done, and took off at the time I was supposed to go. Funny thing was, I think she wanted me to stay because the other morning staff didn't show up, but I decided that I am not going to do any favors for her. Is that wrong? Am I being unreasonable? And is there someone at work that you just can't stand?