If that's the case then how the hell does she know Thief and Rouge are female leaning?

Every Thief so far and 2 out of 3 Rogues have been gals- Callie knows Roxy’s Class and Rose likely wrote about the Ghosts in the Bubbles as well, since Callie does know about Meenah. By the gender split she’s seen, and knowing Thief and Rogue are an Active-Passive pair, it’s fair to assume Thieves and Rogues are mostly girls, but having Rufioh as the outlier- And if Rogues can be both genders, it’d be weird to have one Class not gender-locked and the active counterpart locked like that.