Fair enough, although I did not think that was what the others had put into dispute. Yes there were reasons which could account for such a calling out to be made - although I will still insist on the distinction of saying that good writing would insist on it being presented roughly as is by another person from whom it would be in-character, or presented differently by AmRose in such a way that it was in character for her.
His stated complaints were something you interpreted as sexism, yes. Let's just go with that they were, for now. It still doesn't have any more impact than when you've brought it up several times before. I'll spare you the rudeness of posting the previous comment for a third time, but will reiterate - the MC at this point has valid reason to be in significant distress over the safety of his sister (we are indicated that this is, in fact, the case to at least some degree), a character completely unlikely to be a bitch in the situation completely bitches out on him over it, and his only response is to be cowed into submission by her cruelty even though this is also not really consistent with his own character depending on previous choice. This is bad writing.
She has shown a strong personality multiple times. It was out of character for her to do this. Personality is not just a sliding scale of strength or weakness, it is a matter of character and the character is off. She goes from almost pathologically agreeable and permissive to alpha bitch in 0 seconds flat. A devoted pacifist can have a strong personality, a warmongering dictator practically requires a strong personality, but it is out of character for a devoted pacifist to suddenly lead a coup and invade Poland - or vice versa, strength of personality not withstanding.
She shouldn't have called him out on it because he had (and she knew he had, yadda yadda) valid reasons for genuine distress over it that her character as established so far would have been considerate of rather than being confrontational to aggravate it. Again, returning to the above stated on what his actual motivations are and why that is beside the point...
I see a whole lot of people not liking that this was badly written. I don't see people upset that someone might call the MC a hypocrite. So, returning yet again...
If you just want a character to (/ are glad that a character has) call him a hypocrite for not wanting her to be as sexually adventurous as he is, fine. There are plenty of ways that that accusation could be leveled at him in the game in a well-written way. This ain't it, chief. The execution is poor whether it made a statement you like or not.