I actually don't know if this is the case all over China or just some parts, but I've seen it mentioned in a lot of places.

Salsa: https://satwcomic.com/manners-are-important

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[–] 1 point 7 months ago*

isn't it bad to be thirsty and good to have a nice drink?

Plus, there are thousands of years of culture in offering a drink implying trust and friendship.

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