Ye but like historically dukes wouldt just marry princesses and other dukes(outside of som incestuous outcomes) most times as long as the lower ranking noble had eithwr a lot of money or an incredible power or was from an historically relevant family jt was still fine.
Like it wasnt common but like not to the point of a servanto going "teh only problem is their standing
My understanding of the plot would be because grimaldi is not on the same level as woodpecker, grimaldi isn't rich either (the life potrayed in grimaldi territory are often more humble than the extravagant southern area) also no one likes grimaldi lol
And the ml isnt known to be sane either after his curse broke so i guess people don't really care about who he has interest with but i do agree that those ppl are pretty weird for not caring at the fact that adrina is currently known as a guy, i guess that's just how they are; class and pride above everything, because "well at least he's on the same standing as the duke" even tho he's a guy

I dont remember exactly but like wasnt her father a viscount?
Even tho she's pretending to be her brother isnt she technically the only heir to a noble title of high rank right now? Same as the duke
Had she been brought up normally she would have been a potential match for the duke so i dont get it