double-standard

She was sitting there. And I felt anger surging through me.
Why is that I don't collect the key then she go and talk talk talk. Who on earth do she think she is? She don't have the right to reprimand me if she also don't do it right?
She said that because i came to school earlier than she did, i should go and take the key. but today, i saw her sitting outside the classroom, which meant that she come to school earlier than me, and she doesn't take the key.
SO it's sort of double-standard right. and i hate her for it.