I assume all of Advent are friends. Like, real, actual friends.
I assume that even if some or most members of Advent would not collab with a guy, they won't push that on everyone and want their genmates to do well.
I assume that given the backlash, members of Advent lend Shiori their support and tell her to do and be whatever she wants to.
So now, tell me why Nerissa doing so publicly is wrong, or if you think anything I said is wrong, tell me why.