For the source text click/tap here: Pesachim 86
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Our Daf tells a story about Rav Huna the son of Rav Natan who visited Rav Nachman bar Yitzhak and behaved in what appeared to be an uncouth manner –
He agreed to sit immediately without first offering a polite refusal
He accepted a cup of wine, again without an initial polite refusal
He drank it in just two sips.
He looked directly at his hosts without diverting his gaze.
When asked how he could behave so poorly, and still call himself a Rabbi, he explained each of his actions based on a statement from the Talmud including the maxim:
You should do whatever the host tells you to do, unless he commands you tzei (leave).
This leads us in an exploration of table manners in the talmud (halacha) and antiquity