Chaotic Good: Saving peuple from Tyranny whether they want it or not! (Or even actually need it or even if it makes the general picture worse for everybody.)
Rosa might also react vocally that way, but without actually feeling it deep down. She just likes provoking Borgrim and playfully bicker with him.
He actually offered her a brooch and he's smarter than he seems. Rosa thinks he's a pretty chill guy, under this gruffy and unwashed shell.
She's more warry of Faust de la Suerte, but she's also warming up to him. It's also funny to see Rosa has more empathy for the random fleeing hoodlum than sewer nobility. (Probably because Rosa readily identifies with the former rather than the latter).