madwoman, I read all the comments after yours and put two and two together, I'm not attacking you, merely explaining what the OP said and why.
I agree the sentiment is abhorrent, unforgivable, but when I realised the dynamic at play here, felt a little explanation would help. I lived in Egypt for 3 years, it was hell on earth, the mindsets I encountered would turn your hair white, your eyebrows would be so far back as to be half way down your back. Women forced through poverty to marry revolting, really disgusting men they have never met before the wedding day, forced to endure all kinds of sexual depravity, because if they didn't they would starve, and be on the streets. If that happens they would be at the mercy of ANY man. I've met these women, they are the saddest you have seen in your life. the comment by the OP is actually fairly uncontroversial in comparison to what I have seen and heard routinely. You are right to be outraged, it IS outrageous, but it's a mindset shared by whole countries. Accepted by both men AND women.
Erm, I agree that the SIL is not the issue per se, it is the fault of the H, pure and simple, SIL is merely the tool he is using to undermine and wreak misery upon. She is lapping it up, again I have seen this time and time again perpetrated against english wives, it's boringly common.
It's far easier to focus anger on SIL than it is on the H, but it's not the root of the problem. OP try to see what he's doing to you, what he says, how he treats you and how he acts.
It doesn't matter what his family think of you. Their view on life is skewed and wrong anyway. All your real friends, when they know the truth of your life, will understand you and why you left. No-body will laugh, we certainly won't.
disengage, get out in any way you can, get away from this situation with your head held HIGH, you have done nothing wrong.