Elegran I believe that cis works for either gender, but few men prefix their descriptor with it. Why people bother is up to them, I wouldn't bother - unless someone is trying to indicate who they are willing to sleep with I see no point. All of these prefixes are just telling other people where you stand - if you don't want others to know, or don't care you don't have to use them for yourself, but it is only polite to describe other people how they've described themselves, hence the use of pronouns.
Do you really see trans women as bitter? Or is that because of the few angry idiots who can't accept a different view with dignity and go raging about on social media being pretty vile? Genuine question, not to argue with, but understand.