I think people just need to think sensibly, if you're in a situation where it is clearly not a good idea for you to use the male bathroom then don't. For example, me where many people know me although I might not recognise them, or if you don't pass well at all, or are still presenting female. However I read the post as saying to men who do pass, but just haven't had the push to go and use the mens.
FWIW I don't have a problem with women posting here, especially if they have input on things we don't all know, i.e. bathroom etiquette. And plenty of us don't seem to identify as transsexual, does that mean we shouldn't post here either?