That is what this is about? There is something wrong with the way our culture is shifting. There is absolutely nothing wrong with Monica's choice. It is literally the most pacifist choice you could make. Anyone who feels "harmed" by her choice is only harming themselves.
I care deeply about social justice, and I'm totally on Monica's side here. Even more so because as far as anyone can tell, she wasn't even violating a CoC yet, and would probably have followed it if it was sufficiently clarified. But at the most basic level, I feel gender-neutral language should always be okay.
In fact, I think it would be healthy if language in general developed in a more gender-neutral direction. We don't use special pronouns to divide people based on other characteristics, so why gender?