Thats a gimme I can’t give because MC secretly understands Russian and that dramatic irony changes everything. If she spoke Russian because she didn’t know the English translation, that’s a completely different thing. We know she uses Russian to secretly say things out loud she doesn’t want people to understand, for whatever reason she does it.
It doesn’t matter if it’s based on anxiety, that doesn’t give anyone a free pass to be rude during a conversation like that. If you start speaking to someone and they begin “talking to themselves” that’s also super rude