We've seen her trying to act tough in the trailers so far and... um....
...yeah, in the comics (up until recently for reasons having to do with writing skill), she has been a well-respected cheerful but military tough kind of character (keeping in mind her characterization has been ALL OVER THE PLACE for decades. But more consistent for the past decade.)
According to a wide swath of internet responses, Larson either fails at acting tough and awesome due to some kind of inability, or she wildly succeeds at acting tough and awesome because she's a woman.

(This, incidentally, is also Larson's own opinion of her performance.)
The marketing for this film has been an amazing car crash into a dumpster fire. It'll still make a billion dollars, because duh.
Anyway, that partly explains this spoof trailer some more: they went with "her idea of acting tough is to be a sociopathic self-centered teen."
I'm not gonna lie, I'm gonna have to restrain yelling out "PUNCH THE CAT, FURY,
IN HIS LITTLE CAT FACE!" when I get to that scene in the theater. If other people do, I'll completely lose the next few minutes of plot from trying to survive laughing.