I want to stay far away!

My husband says family is family and you stick together no matter what. In theory, I Love the idea but in reality it’s not always like that. I’ve experienced throughout my childhood and adulthood that extended family can be toxic, leeches and just because you are related doesn’t mean you have to endure a dysfunctional relationship. Ironically, my husband has 4 aunts and with 2 the family has had a falling out, there’s no way they’ll ever make amends. But here he criticizes my relationship with my uncles and aunts. He also has a jealous, competitive sister who is never happy for him for any of his accomplishments. I have a brother and we have a good relationship, I wished we would closer but accept it the way it is.

My issue is, I push people away when I see their dishonest, opportunists, 1 sided relationship. I become so repulsed that I want nothing to do with them. And that’s how I feel about my S-I-L and her husband. My husband has fully admitted his sister‘s behavior but fights with me about it and at times denies the obvious when there have been arguments. Does he do it to be defiant, feel guilty for throwing her under the bus? I don’t get why at times he sees for what she is and others he pretends like he’s got no clue?