I think all that Sandi was saying is she does this to get a reaction from you. She knows the silent treatment, the sarcasm, etc. just pisses you off. It shows in your reaction to her; hurt feelings, getting mad, looking defeated.
If you take your reactions away, she loses her reason to be snotty. And if she still remains that way, it doesn't matter to you. You are fine with however she chooses to act, you can't control that. You can control your perceived reactions to her. Yes, it may tear you up inside, but only show her the same LSG that she would see if things were going great. Or, the LSG that would not care if a stranger walked by him in the store and didn't give him a second look.
In other words, DETACHMENT.
BTW, I'm keeping myself in mind as I write this. I struggle with the same feelings.
