These are my sentiments as well.
However, I'm not for the condescension that many of these people lay on others who dare disagree with them on the topic, while at the same time preaching tolerance and respect to others. Condescension to me is just as much of a personal attack, because it's a tongue in cheek way of attempting to paint someone as being beneath you in intelligence, status, etc.
As you mentioned, if she wants to be addressed as a woman for this reason or that reason, that's perfectly fine by me. However, I'm not an advocate of attempting to speak for an entire gender as if the word "girl" is now somehow toxic, and that anyone who calls an adult female "girl" is now some sort of dickhead. For gals of any age, I have never for instance heard of a "women's night out." Many times, I can guarantee you nobody is calling an adult female "girl" out of condescension.
What I disagree with is like you said, the notion that all people need to start changing their behavior and the speech that they use, and conform to someone else's way of thinking.