Do you think it's okay that I'm irritated with my boy crazy friend?
What do you mean by boy crazy?
She frequently flirts with guys, casually dates guys from other schools and people she meets on Facebook.
You shouldn't be so concerned with how your friend handles her relationships. If she wants to behave that way with guys, then that shouldn't bother you. She is free to act how she wants, just like how you're free to act like how you want.
Whatever, I just think it's super annoying.
I don't think it's reasonable for you to be annoyed by your friend's behavior. She isn't hurting anyone by talking to lots of different guys, so you shouldn't be so concerned about it. You should let her live her life.