Maybe s/he's referring to the snarky, demeaning "cleaning lady" and coffee-fetcher type of remarks from Ann Coulter and Michelle Malkin. Those aren't really things one would ever say about a man, imo.
I'm not saying their opposition to her is sexist - I don't think it is, because I think a different woman would be fine with them - but those remarks have a hint of sexism in them. And yes, women can be sexist.
If the nominee were a man, they would have been referring to him as a janitor.
The references were not made because of her gender, but because of her lack of qualification in comparison to the other candidates.
BTW, both Michelle Malkin and Ann Coulter most preferred Janice Rogers Brown.