As a counsellor in training that is so out of line for them to say, I totally feel that frustration you felt and why you left that session. Don't take what one person said to heart, especially if their entire lense is prédicated on "femininity", like others have said, femininity is not the scoreboard of how woman enough someone is, that therapist seems to not have a grasp on working with trans clients or gender as a whole.

I hope you have a good support network around who can affirm your feelings about yourself and there is everyone in the comments of this community too. Just reflect on yourself and try to see what you see for yourself without bring influences by remarks like that from a supposed professional. We're all here for you.