It depends on who you’re reading. The key words I think in your description are “as defined by men.” I think very few will say logic itself is invalid. More commonly what I’ve seen is the idea that what we consider “rational” or “logical” (especially as contrasted with the "emotional) is itself influenced by predominantly male ways of thinking. An example from the ethics I’ve studied is that men tend to think in much more rule-based ways, while women tend to think more in terms of relationships. A lot of people would consider the first more “rational”, but it’s not clearly a better ethical approach. In fact there’s one famous study that came out saying men were better developed ethically than men, and was criticized on this same principle - that it was considering “rational” rule-based systems as better than “emotional” relationship-based ones.
Keep in mind when reading feminist writings there’s not always one thing that all feminists believe. I’ve done some fair study, and what you’re talking about is one of those areas where a lot of people disagree. So you’re going to find different things in the literature that don’t all fit together.
