http://tvtropes.org/pmwiki/pmwiki.php/Main/MarySue
Mary Sue is a derogatory term
Oh.
It is not “derogatory” in the sense that you used the term; you claimed it was misogynistic. It isn’t.
Er… there kind of is. At least in Western culture, there’s a tendency to shun women who are perceived to “do it all,” without perceived difficulty. It does not matter if the term came from an actual character; it’s still a product of the sexist culture that we live in. Culture does not exist in a vacuum.