"It" is often an insult in English, too. In fact, a friend of mine uses "it/its" pronouns and says it has a hard time getting people to accept that because they don't want to insult it. But... those are its pronouns! It's a cyclical disagreement lol
And goodness... I love grammar, and this is a lot of really awesome data grammatically! So if I'm hearing this right, if say a hand is given a masculine reference, then even if you say "her hand" it would be masculine. That sounds a lot like how, for a long time, the person who delivered mail was "the mailman" regardless of their gender. The same for like "garbage man" and some others that I can't think of now, since they've mostly been rephrased (although a lot of people still use the old, gendered terms).
I also LOVE the idea of part of the euphoria over a pronoun is because it's NOT EVEN POSSIBLE in other genders. That makes it even more of an act of rebellion, even more special.