(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" (co

(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).