What is the whole ethos of egalitarianism
Simple, that people are treated on the basis of their personal attributes except for those that are based on their sex.
I understand that anything that challenges feminism generally gets shit on, which is unfortunate. In many ways, it's understandable. The majority of people who oppose feminism are men who are very keen to see their natural advantage (in the sense that they're born into advantage generated by a deeply sexist society, not natural in the biological sense) continue into perpetuity. Personally, I just find it difficult to reconcile my beliefs in an egalitarian society that is free from sexism with a movement that openly encourages sexism.
An opportunity for women who have been the victims of domestic abuse and/or sexual assault to find comfort in another victims is a fantastic idea and certainly not something to which I'd object. The idea of a room devoted especially to women at the exclusion of men, however, is sexist and intentionally provocative; except for, of course, when it is used to provide genuine support to abuse victims.
Part of me just feels like feminism would have a better chance of achieving its goals if it moved on from the "us vs them" mentality and were more constructive in its approach. For real change to be sustainable, you have to unite the masses and that's something I don't think the feminist movement does.