A guy wants to ask me to a formal dance I have on Saturday! I don't know how to reject him because of my mutual friends?

He's one of those bad guys and I really don't wanna deal with the rest of his little group messing with me for the rest of the year and I don't want him to ask me to dance. Last time he got close to asking me I picked up my phone and said "hey babe"... I don't have a boyfriend. I thought that would make him back off but I still think that if I show up to the dance without a date he's gonna ask me to dance. I am by no means a shy person I mean I pied the most hated staff in the face. I also feel like it's gonna make it awkward between my guys friends that are friends with him. What do I do?
A guy wants to ask me to a formal dance I have on Saturday! I don't know how to reject him because of my mutual friends?
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