Should We Be Friends?

okay so i have this friend named hope and she used to be funny and cool to be around but now shes all goth and she hates school and doent give a crap about grades. she flunks every cl and she just says oh wateva f*** school. im a straight A student and shes a straight F student. she always says DUH to me, and calls me a retard when i say what does that mean? she says man your such a retard. GOSH. thats what she says to me every day and im really sick of it. should i be friends with her??? :P