
I don't really get the hate towards the princess. There was obviously no malicious intent to her throwing the tea, she wanted to confirm the duke's feelings. She even made sure the tea was cold, even the FL felt that she meant no harm. The reason she went there in the first place was to warm an unknown woman about her highly suspicious husband. Maybe she has ulterior motives, but so far she seems pretty good.
I love seeing these two relationship-noobs awkwardly trying to navigate their marriage. They're kinda shit at communication, but it's okay because they're getting better, and they obviously love and respect the other. Cuties.