Link was grateful that Zelda switched conversation focus onto Purah, because there was a potential argument brewing there that didn't need to be had in public. What she- and by extension, the rest of the ruling class -had seen as 'protocol' wasn't something that the common class cared about, and he hadn't been referring to anything else.
He sincerely hoped she wasn't expecting him to start maintaining what she thought of as 'proper appearances' when she was the only one around to even know of them to judge him by.
He was predicting that evening was going to hold a fight. Fun.