I mean, unless you were raised by hippy parents who raised you androgynous from birth, if you are a trans woman, you experienced male socialization. All that means is people treated you like a male. It doesn't mean anything beyond that. Socialization refers to things external to you.

I think there's a degree of internalized transphobia in rejecting such a clear and straight forward concept. I get not wanting to acknowledge our pasts, but it is internally transphobic to deny one's own trans experiences.

There's nothing shameful about having been socialized male.