there was an article on this site a couple of years ago about a female IT person who was expected to keep up appearances, even at IT events, when she would have preferred to dress the same way as men would as she was more comfortable.
Be careful when extrapolating from individual instances.
You'll get that in any industry all the time. Viz. the current bizarre case in the UK about a women being dismissed by a female boss for refusing to wear high heeled shoes for work. I hope she wins the case at the tribunal and gets a good settlement. But it has fuck all to do with IT. There are far more aggressive places for women to work than IT.
Blokes, in a group, can be real arseholes. Then again, so can women. I've got several female friends who say they much prefer working with in a predominantly male environment.
I've got nothing against women in tech, engineering or wherever. But I prefer to let them speak for themselves than try to speak for them.