I absolutely hate my husband's sister.
Why do you hate your husband's sister?
I have enough fun in my life and dont need her.
You should do your best to note hate your husbands sister. She is technically your family now, so it is important that you do your best to get along.
That's a silly argument. She sucks.
You haven't described any particular obnoxious or rude behavior on her part. If it's just some trivial quirks she has, you should try to be more tolerant. Like it or not, she's family.