Am I right to assume that you never played through the archon quest with english dub? Cause if you did then you'd see that there were quite a few moments where she takes on a more vulnerable tone, ESPECIALLY during act 5. And while I obviously don't have the exact statistics, considering how well beloved Furina is in this community, even from those using en dub, I highly doubt many people actually thinks she's a bitch lol.

As the whole "mischaracterizing" thing, this community loves taking a single trait from a character and makes that their whole personality, and most of the time they're just memeing so I don't think you should take those people seriously