Insults in Harry Potter?

My friend knows so much about Harry Potter (10x more then I do!) and I want to know more insults cause she's always dissing Slitherin and it's making me mad! I think just because Slitherin has few bad people doesn't mean it's 100% bad (please don't argue me on this, just please answer my... show more My friend knows so much about Harry Potter (10x more then I do!) and I want to know more insults cause she's always dissing Slitherin and it's making me mad! I think just because Slitherin has few bad people doesn't mean it's 100% bad (please don't argue me on this, just please answer my question!). All I know is Mud-Blood, that's it. So could you please help me? Ty <3 :)!
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