There was just a presumption of incompetence and an insinuation that Mayer's accomplishments are not _really_ accomplishments, without any given reason. The OP

There was just a presumption of incompetence and an insinuation that Mayer's accomplishments are not _really_ accomplishments, without any given reason. The OP didn't state "Mayer must be incompetent because she's a woman", but that's not how sexism works--people perpetuate sexism by allowing sexist attitudes to color their judgments about the merits of individiuals, often subconsciously. Why do I think it is reasonable to ascribe sexist attitudes to the OP? Because the OP is willing to presume incompetence of an engineer a) without evidence ("I can picture it now...") and b) in the face of substantial evidence to the contrary (the alarming success of GOOG), when the only atypical characteristic of said engineer is that she's a woman.