Not in my opinion. Lakoff's conclusions were largely the result of her own predetermined beliefs about the role of language between women and men and what she thought was the social norm for how women spoke. Her failure to discover that the same language patterns she uncovered between women and men were also present between dominant and subordinants that didn't involve gender made for more rigorous investigation by others.
She's not discredited or anything like that, it's just that language usage was shown to be more complex than she postulated. Her work was incomplete and one of the ways it was shown to be incomplete was the discovery that subordinants use certain words and phrases intentionally so as to control where the conversation goes and to better underscore any philosophical differences. In other words, the subordinant is the one really in charge. Regarding the use of the word lady in 'Lady Vols', this explanation fits well in my opinion. And it explains why those such as reverseosmosis want to do away with the term - they don't like not being in charge of the conversation.