lol @ "*name of one of my friends* is just a slut, why do the boys like her?"
Was she serious? She answered her own question before asking it
But seriously, rise above She may want to be petty and rude and so forth but it only works so long as she's getting a reaction from you. Agree with her, even if you don't really agree (unless she says lets go shave your head this afternoon). Ignore insults, and even maybe find something to compliment her on You'll feel better, trust me.