I'm not sure how you could have validated that, sounds like she was just looking for an excuse to start a fight. Overall you did well not letting things escalate.
Sometimes WAS's will bait the LBS constantly to create tension, it's their way of convincing themselves that leaving the M is the "right" thing to do (especially if the LBS lets themselves get pulled into fights).
Early on my XW treated me pretty poorly, and then at one point she actually came to me and explained she had done it to "help me move on" but felt bad because I wasn't reciprocating. So she said she wasn't going to do it anymore. And she didn't after that. So yes, they do sometimes do it intentionally to drive us away.
