Comment by yetanotherasian
2 years ago
Rude seems like a too strong a word for it but it's normal culture to fill someone's cup if it's empty and it's rude to poor for yourself without first filling your friend's cup, and ideally they'll ask for the bottle to fill yours once you've finished filling their's but it's common to just fill your own after filling theirs.
As for (2) I don't know any culture where if a friend asks you to meet up with them that there isn't some expectation you'll accept the offer and if you can't you'll at least try to make the friend feel you'd really like to but for whatever reason you can't right now. If you just responded "no, I don't want meet" I'd except after a few such responses you'd no longer be friends in any culture.
(2) is perhaps poorly and ambiguously worded on my part. What I meant to convey was: "It's rude/impolite to refuse your friend's offer to top your drink up" (context being: you're already out drinking).