No one is getting snarky or aggressive at anyone, just to throw water on those flames. But sarcasm doesn't help.
I don't think any of the people vying for her Fi-ness is using "because I do that" as an argument. I suggest people watch a bit of the movie again (it's on YouTube), if this is bothering them as much as it did me, because it reminded me of a lot I didn't recall. She's actually quite outspoken and direct about her opinions, a characteristic I don't quite relate to INFJs. And it wasn't just "blowing smoke in her parent's face" that made me think Fi, but all of her actions in that scene put together, including the fact she did it all in front of important people she had just met.