"Why do you have to be such a bitch?"
"Well, you're really annoying sometimes."
Then either "Like when? Really, I want to know because I'm trying not to be." If she offers an example then you decide whether she's right or whether she's just being a bitch.
If she is being a bitch, then "Fine, out you get."
I'd have no problems kicking her out then and there, and if I was calm enough I might consider driving her home, then asking her to get out of the car.
As for the nickname, did one person start it and then others join in later? If you made some new 'friends' after that nickname caught on they're only using it because they think it's just how it is in your group. They probably think it's your real nickname because everyone else uses it and did before they came along.
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