When a waiter asks how you would like your steak to be done, you without hesitation or say "rare/medium/well-done"?
That's YOUR choice and expectation and its done without hesitation,, right?
saying nohanks" to a drink should have the same expection and confidence behind it.
What If the waiter gave you a weird look? You'd think he was strange, correct?
Same goes here, if you get weird looks..then thats just it, they are strange people who are gonna have an absolute horrible morning tomorrow, and let it be.
I also advise not to make a deal out of it to them , you being sober doesn't require a explanation nor will they understand. Just go for your friends and yourself.