遠慮してください

BさんとZさんは夕飯を食べています。

Zさん："... and you know it is interesting, the Japanese words for miso soup (味噌汁) and sweat (汗) contain the same kanji."
Bさん：「uh huh... so... first of all, that's not true, those kanji are slightly different, and secondly, are you enjoying the lovely meal I prepared for you?」
Zさん："I ... um... oh... of course!😅heh heh delicious!"
Bさん：「馬鹿。」