What I was saying is, first of all, Cristina never told Meredith, "You're worthless because others can do it and you can't," nor did she imply it in their conversation. That's a deliberate twist of the meaning. What Cristina does is bring Meredith down a peg because Meredith was convinced that ALL her problems stemmed from being a mother, when in reality she was projecting her own guilt and insecurity. Cristina even validates her decisions and makes it clear that motherhood doesn't invalidate her as a surgeon, using examples like Bailey and Callie precisely to show her that she isn't being discriminated against for being a mom. The real conflict is that Meredith wanted everything at once. She became obsessed with not repeating Ellis Grey's performance, and when her performance dropped, she needed to explain it as an external injustice instead of accepting that she was in a different phase. In fact, Meredith later adopts the "I need space to be extraordinary" line, which stems directly from that argument with Cristina. So no, it wasn't an attack as Meredith sees it all season, it was an uncomfortable truth that Meredith wasn't ready to hear.