Too Hip

I really don't like the way some people try to horn into conversations by trying to act like that they are already part of the team when they haven't "paid their dues." What I mean are people that are new to a group and immediately begin to pretend like they are a regular. For example, there is a person on our team who's name is Fletcher, but those that know him call him "Fletch" which actually is a pretty cool nickname to have. We have this woman who just transferred into our group who immediately refers to him as "Fletch." She is the type of person who pretends to be your biggest ally only to backstab you at every opportunity. Hearing her constantly bring up "Fletch" is so grating that I want to retch. A popular term that she tends to recite is "peeps." As in, our group needs more "peeps" if we are going to deliver this project. Did I say she gives me the creeps?