Ferdinand have lived a rough life so other nobles merely insulting him won't get a reaction out of him.
Rozemyne following his lessons also doesn't show the reaction the haters want.
Hartmut (the left red hair) and Eckhart (the right green hair knight) are fanatically devoted to their respective masters and are a lot less chill about them receiving such treatment.
So Cornelius (left green hair knight, younger brother of Eckhart) and Justus (silver hair scholar on the right) basically have the job of trying to hold their respective madman back.