The Matchmaker Gets Matched! - Chapter 12

Why is ml so shitty to fl brother? And why isn’t fl saying anything? I mean she gains nothing out of it only that her brother gets harassed? Sorry but that’s confusing and annoying to read. I mean he’s just being rude, if I were the brother of the fl (Heinte or what his name is) I would tell that knight(the duke) he should show some manners and stop coming so close to an unmarried woman. Would satisfy me