Why does my sister laugh at me?

we're both in our 20s living at home, i hate her and can't stand her sight, she's a mean bitch, she laughs at me when she sees me, you know that laugh you make at someone pity or crazy? that's what she does, she knows how to push my buttons.

any female can explain her bitchy behavior? why would she laugh at me? is it to provoke me and get me in trouble? she ever tasted her blood but apparently she will soon.

Why does my sister laugh at me?
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