This is what the whole "like a girl" is about: if you express your femininity in the things you do and the way you look, people associate that with incompetence.
Visual ticks - wringing your hands, messing with your hair, licking your lips - make you appear less confident, and has nothing to do with gender.
The vocal tick - making every sentence sound like a question - is distracting no matter who presents it.
These aren't gender specific criticisms in any way. Regardless, unless you're addressing a gender specific topic, why bring your gender into it in the first place? I'm interested not in the person presenting about algorithms, but the algorithms themselves.
A man would be rightly chastised for presenting a de-duplicaton talk with bright pastel blue slides, pictures of beer, and rubbing his forehead while presenting, why shouldn't a woman?
EDIT: I must go to the wrong programming conferences, never see suits. Wish the down voters would just share their experiences!
I also do not penalize for dress during interviews either. It's a distraction from the important things, and irrelevant to the answers to the questions of coding ability and culture fit.
Aside: Atlassian is more interesting. H/P has better food.