It's a sign of great confidence or ignorance to assume a follower of Slaanesh would ignore wounded pride and not immediately smite whoever insulted them regardless of the consequences. The fact Geron considers whether it's worth the catharsis of breaking the Navigator's pride to have to deal with finding a new one is proof of why he's managed to survive as long and rise as high as he has.

He settles for removing her from her comfort zone.

"Excellent. Then you'll be accompanying us onto the planet. The Captain is more than sufficient for what the ship currently needs and your talents will be put to better use on the ground."

And the moment he finds a replacement who knows their place Slaanesh will be receiving an especially potent sacrifice.