@backspace The demon king is one of the possible capture targets for the heroine (I fuzzily remember), so it makes some sense that she would react to him. Even in an "Oh, what a really hot guy," way.
Seriously, stop debating the troll on his sexist rhetoric. You're giving him the implication that what he's saying is meritable, instead of unreasoned soup. Just block him and move on.
On more important, chapter-related news: RIP, hero, your letter inspired death will not be in vain.
I mean, everything we're imagining down in that dungeon is always gonna be more horrible than whatever the author can come up with. It's good suspense.