These maids are special, though , since they serve the princess(es) only and they aren't from branch families or so. They are legit noble girls that are sent to serve as maids for a short while to "learn" before they get married. That's why they act like that.
And Climb isnt a real knight, he's just a glorified bodyguard/person of interest, and only due to Renner "acting spoiled" about it in the eyes of many. I mean, even Gazef has it tough with nobles, and he is an actual knight by order of the king.