@alice This is definitely a thing, but men talk over me more post-transition than they did pre-transition, even though I'm significantly more confident and assertive these days.

I think men, even timid men, are perceived to be assertive, and women are not. Women can compensate for this by becoming particularly assertive but I think you have to actually be more assertive than most guys to be perceived equally. And then you're in danger of being labelled bossy.