Why should she have to?

It's all in the subtext: the way they never put her back on camera, the stifled giggling, etc. Having a moment of confusion about how to address a transgendered person, while embarrassing for both parties, is understandable but it's what they do afterward that makes this gross.

JBF: Because human beings are, in-time, conditioned to certain things... such as a woman having a softer and higher voice. When a conflict occurs, the mind has few reactionary methods to address the cognitive dissonance.

It is the same pricinple as why that video of a cute, little 14-year old girl belching like a 50-year old man with a beer gut, is funny.

Now, stop trying to thust your concept of morality upon nature.

Either you're a troll or you're yet another moron who doesn't let things like science and medicine get in the way of gut feeling and "common sense". And your gut feeling is telling you that trannies are iiiiicky, brain chemistry be damned.

I think we're talking about two different things here.
You're talking about the responsibility of others in how they perceive her, whereas I'm talking more about the responsibility of her to herself in her own personal and gender identity. She has no responsibility to adopt a feminine voice if that's not her wish, others be damned. It's her human right.

I know everyone has their own mental biases towards others, and usually that its an instantaneous gut reaction. But most educated people would take a confusing situation and still outwardly be polite and courteous despite it. It's not an issue of morality, just acceptance and decency really.