It looks like there might be some misinterpretation of what Syka said in clause B. She didn't say, or even imply, that she always has to win an argument. What she said was (paraphrased) "If we're arguing about something you did wrong and you try to blame your erring on me1, or if you try to dodge a question about what you did wrong2..."

1He's been busted kissing another girl, guilt is established.
Her: I can't believe you would do that!
Him: It's your fault, you know! If you hadn't....

2She has reason to suspect he's done something wrong and is asking about it.
Her: Did you go to the club with Wanda last night?
Him: Well, yeah, but there were other people there too.
Her: Did you kiss her while you were there?
Him: What in the world can that be?! *points off in the distance* Erm, anyway, Dave had a lot to drink and so we had to drive him home.