like I say, I don't think it's the fact that you retaliated, because you didn't, but from the landlord's point of view it looked as if you might, and he'd want to stop trouble before it started. He'd remove the one who he thought was likely to cause trouble physically, not the one doing it verbally. Perhaps he should have chucked her out earlier but perhaps he simply didn't notice. Fist fights will be more of a problem for him than slanging matches. Harsh but you've just got to learn to suck it up.