There are too many men and too few women on lemmy for this to work. Men frequently out-ratio us simply because of numbers, they derail our posts, and they speak loudly and often on topics they have no understanding of. This is a place where we expect people to be women+, and this changes what we are comfortable talking about and how we respond to each other. Means we can talk freely in a way we can't otherwise. In theory a few men offering their perspective once in a while is fine, but in practice that's not what happens.

For example imagine we discuss an injustice we experience because of our gender, and then men show up to defend themselves in large numbers by commenting and derailing; belittling us and dismissing our concerns. Why would we then try to discuss injustices ever again? If we can't be safe here? We could remove men on a case by case basis, but sometimes you want a women only space because of the expectations this sets and the safety it creates.

I don't really see the issue in making a safe space? Have you read about safe spaces before? They are sometimes necessary.